Fix some typos

Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

README.md

@@ -8,7 +8,7 @@ Kubebuilder is a framework for building Kubernetes APIs using [custom resource d
 **Note:** kubebuilder does not exist as an example to *copy-paste*, but instead provides powerful libraries and tools
 to simplify building and publishing Kubernetes APIs from scratch.
 
-### Installalation 
+### Installation
 
 It is strongly recommended that you use a released version. Release binaries are available on the [releases](https://github.com/kubernetes-sigs/kubebuilder/releases) page.
 Follow the [instructions](http://book.kubebuilder.io/getting_started/installation_and_setup.html) to install Kubebuilder.

docs/migration_guide.md

@@ -139,7 +139,7 @@ Copy those dependencies into the new project's Gopkg.toml file **before** the li
 ```
 
 ## Copy other user files
-If there are other user created files in the old project, such as any build scripts, REAMDE.md files. Copy those files into the new project.
+If there are other user created files in the old project, such as any build scripts, README.md files. Copy those files into the new project.
 
 ## Confirmation
 Run `make` to make sure the new project can build and pass all the tests.

docs/using_an_external_type.md

@@ -9,7 +9,7 @@ There are several different external types that may be referenced when writing a
 * A CRD that is created and installed in another project.
 * A CR defined via an API Aggregation (AA). Aggregated APIs are subordinate APIServers that sit behind the primary API server, which acts as a proxy.
 
-Currrently Kubebuilder handles the first two, CRDs and Core Resources, seamlessly.  External CRDs and CRs created via Aggregation must be scaffolded manually.
+Currently Kubebuilder handles the first two, CRDs and Core Resources, seamlessly.  External CRDs and CRs created via Aggregation must be scaffolded manually.
 
 In order to use a Kubernetes Custom Resource that has been defined in another project
 you will need to have several items of information.

pkg/scaffold/project/gopkg.go

@@ -55,7 +55,7 @@ type Stanza struct {
 	// Version will appear after 'version=' and does not include quotes
 	Version string
 
-	// Revision will appear after 'revsion=' and does not include quotes
+	// Revision will appear after 'revision=' and does not include quotes
 	Revision string
 }
 

scripts/install.sh

@@ -69,7 +69,7 @@ fi
 TMP_DIR=$(mktemp -d)
 pushd $TMP_DIR
 
-# Downloading Kuberbuilder compressed file using curl program
+# Downloading Kubebuilder compressed file using curl program
 URL="https://github.com/kubernetes-sigs/kubebuilder/releases/download/v${KUBEBUILDER_VERSION}/${KUBEBUILDER_VERSION_NAME}_${OSEXT}_${ARCH}.tar.gz"
 echo "Downloading ${KUBEBUILDER_VERSION_NAME}\nfrom $URL\n"
 curl -L "$URL"| tar xz -C $TMP_DIR