Change "confer to" to "confer upon" (#614)

This is just a quick grammer fix.

Co-authored-by: Mason Freed <masonf@chromium.org>

research/src/pages/popup/popup.research.explainer.mdx

@@ -732,7 +732,7 @@ In an alternative proposal where the pop-up behavior is enabled via a special el
 
 and that violates the [first rule of ARIA](https://www.w3.org/TR/using-aria/#firstrule), which is essentially that if there's an element that properly represents the content, use that, and don't use ARIA.
 
-By having `popup` be a content attribute that purely confers behavior to an existing element, the above problems are nicely resolved. Semantics are provided by elements, and behaviors are confered on those elements via attributes. This situation is exactly analogous to `contenteditable` or `tabindex`, which confer specific behaviors on any element. Imagine a Web in which those two attributes were instead elements: `<contenteditable>` and `<tabindex index=0>`. In that Web, many common patterns would either be very convoluted or simply not possible.
+By having `popup` be a content attribute that purely confers behavior upon an existing element, the above problems are nicely resolved. Semantics are provided by elements, and behaviors are confered on those elements via attributes. This situation is exactly analogous to `contenteditable` or `tabindex`, which confer specific behaviors on any element. Imagine a Web in which those two attributes were instead elements: `<contenteditable>` and `<tabindex index=0>`. In that Web, many common patterns would either be very convoluted or simply not possible.
 
 ## Design decisions (via [OpenUI](https://open-ui.org/))