fix indefinite articles usage (mdn#22789)

files/en-us/games/techniques/3d_on_the_web/building_up_a_basic_demo_with_a-frame/index.md

@@ -184,7 +184,7 @@ scene.appendChild(cylinder);
 
 We're getting a reference to the scene handler first, then we create the cylinder element as an A-Frame entity. After that it's all about setting the proper attributes: `color`, `height`, `radius` and `position`. The last line adds the newly created cylinder to the scene. That's it — you've created three different shapes with A-Frame! Here's how it looks right now:
 
-![A illustration of 3D representation of three different geometry shapes displayed on a grey background: the first one is a darker grey torus, the second is a blue cube and the last one is a yellow cylinder.](shapes.png)
+![An illustration of 3D representation of three different geometry shapes displayed on a grey background: the first one is a darker grey torus, the second is a blue cube and the last one is a yellow cylinder.](shapes.png)
 
 It is impressive to be able to create such a scene with just a few lines of HTML and JavaScript.
 

files/en-us/glossary/ice/index.md

@@ -22,4 +22,4 @@ The framework algorithm looks for the lowest-latency path for connecting the two
 - [WebRTC](/en-US/docs/Web/API/WebRTC_API), the principal web-related protocol which uses ICE
 - [WebRTC protocols](/en-US/docs/Web/API/WebRTC_API/Protocols)
 - {{rfc("8445")}}, the IETF specification for ICE
-- {{domxref("RTCIceCandidate")}}, the interface representing a ICE candidate
+- {{domxref("RTCIceCandidate")}}, the interface representing an ICE candidate

files/en-us/mdn/community/pull_requests/index.md

@@ -66,7 +66,7 @@ inappropriate, than it is to follow every guideline to the letter.
 7. If you don't understand a content change that you've been selected to review, or feel that it is too large and complex for you to deal with, don't panic! Feel free to reach out to someone else to ask for help, like a colleague, or someone else in your group of topic review owners (if you know who they are). If you are not sure who to approach for help, then ping our `@core-yari-content` group to ask for help.
 8. Related to the above point, it is rare that you'll be required to review a large, complex content change with no warning, like a complete page rewrite, or the addition of several new reference pages or tutorials. Usually such changes are done as part of specific work streams where the content has been approved for addition, and reviewer(s) have been assigned already. In such cases, the PR should be linked to an issue that explains all these details. If you are not sure, ask the submitter if they need a review of the content, and where the rationale behind the change is explained. Ping our team on [MDN Web Docs chat room](https://chat.mozilla.org/#/room/#mdn:mozilla.org) to ask for help if you are still not sure, or if you think the content is suspicious.
 
-Note: You may encounter merge conflicts as you review pull requests, if a another pull request that touches some of the same files got merged before the one you are reviewing. [Addressing merge conflicts](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/addressing-merge-conflicts) is a useful resource to help you. Feel free also to ask your team(s) for help if you need it.
+Note: You may encounter merge conflicts as you review pull requests, if an another pull request that touches some of the same files got merged before the one you are reviewing. [Addressing merge conflicts](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/addressing-merge-conflicts) is a useful resource to help you. Feel free also to ask your team(s) for help if you need it.
 
 ## Specific reviewer overrides on pull requests
 

files/en-us/mdn/writing_guidelines/writing_style_guide/index.md

@@ -341,7 +341,7 @@ Hyphenated compounds should be used when the last letter of the prefix is a vowe
 Use American-English spelling.
 
 In general, use the first entry at [Dictionary.com](https://www.dictionary.com/), unless that entry is listed as a variant spelling or as being primarily used in a non-American form of English.
-For example, if you [look up "behaviour"](https://www.dictionary.com/browse/behaviour)(with a additional _u_ added to the American standard form), you find the phrase "Chiefly British" followed by a link to the American standard form, ["behavior"](https://www.dictionary.com/browse/behavior).
+For example, if you [look up "behaviour"](https://www.dictionary.com/browse/behaviour)(with an additional _u_ added to the American standard form), you find the phrase "Chiefly British" followed by a link to the American standard form, ["behavior"](https://www.dictionary.com/browse/behavior).
 Do not use variant spellings.
 
 - **Correct**: localize, behavior

files/en-us/mozilla/add-ons/webextensions/api/devtools/inspectedwindow/eval/index.md

@@ -54,7 +54,7 @@ let evaluating = browser.devtools.inspectedWindow.eval(
 ### Parameters
 
 - `expression`
-  - : `string`. The JavaScript expression to evaluate. The string must evaluate to a object that can be represented as JSON, or an exception will be thrown. For example, `expression` must not evaluate to a function.
+  - : `string`. The JavaScript expression to evaluate. The string must evaluate to an object that can be represented as JSON, or an exception will be thrown. For example, `expression` must not evaluate to a function.
 - `options` {{optional_inline}}
 
   - : `object`. Options for the function (Note that Firefox does not yet support this options), as follows: