README: various text fixes

Thank you @essamjoubori, @bcbcb, @namlede

Ref 31b63fc23674ede657f019783ad7b942bb83f9c3

README.md

@@ -47,7 +47,7 @@ cd jquery && npm run build
 ```
 The built version of jQuery will be put in the `dist/` subdirectory, along with the minified copy and associated map file.
 
-If you want create custom build or help with jQuery development, it would be better to install [grunt command line interface](https://github.com/gruntjs/grunt-cli) as a global package:
+If you want to create custom build or help with jQuery development, it would be better to install [grunt command line interface](https://github.com/gruntjs/grunt-cli) as a global package:
 
 ```
 npm install -g grunt-cli
@@ -57,7 +57,7 @@ Make sure you have `grunt` installed by testing:
 grunt -V
 ```
 
-Now by running the `grunt` command, in the jquery directory, you can build a full version of jQuery, just like with a `npm run build` command:
+Now by running the `grunt` command, in the jquery directory, you can build a full version of jQuery, just like with an `npm run build` command:
 ```
 grunt
 ```
@@ -209,7 +209,7 @@ As the source code is handled by the Git version control system, it's useful to
 
 ### Cleaning ###
 
-If you want to purge your working directory back to the status of upstream, following commands can be used (remember everything you've worked on is gone after these):
+If you want to purge your working directory back to the status of upstream, the following commands can be used (remember everything you've worked on is gone after these):
 
 ```bash
 git reset --hard upstream/master
@@ -218,7 +218,7 @@ git clean -fdx
 
 ### Rebasing ###
 
-For feature/topic branches, you should always use the `--rebase` flag to `git pull`, or if you are usually handling many temporary "to be in a github pull request" branches, run following to automate this:
+For feature/topic branches, you should always use the `--rebase` flag to `git pull`, or if you are usually handling many temporary "to be in a github pull request" branches, run the following to automate this:
 
 ```bash
 git config branch.autosetuprebase local
@@ -230,7 +230,7 @@ git config branch.autosetuprebase local
 If you're getting merge conflicts when merging, instead of editing the conflicted files manually, you can use the feature
 `git mergetool`. Even though the default tool `xxdiff` looks awful/old, it's rather useful.
 
-Following are some commands that can be used there:
+The following are some commands that can be used there:
 
 * `Ctrl + Alt + M` - automerge as much as possible
 * `b` - jump to next merge conflict
@@ -354,7 +354,7 @@ callback( jQueryFromIFrame, iFrameWindow, iFrameDocument );
 Loads a given page constructing a url with fileName: `"./data/" + fileName + ".html"`
 The given callback is fired when window.iframeCallback is called by the page.
 The arguments passed to the callback are the same as the
-arguments passed to window.iframeCallback, whatever that may be
+arguments passed to window.iframeCallback, whatever that may be.
 
 ```js
 testIframeWithCallback( testName, fileName, callback );

test/unit/support.js

@@ -47,7 +47,7 @@ testIframeWithCallback( "A background on the testElement does not cause IE8 to c
 });
 
 
-// This test checkes CSP only for browsers with "Content-Security-Policy" header support
+// This test checks CSP only for browsers with "Content-Security-Policy" header support
 // i.e. no old WebKit or old Firefox
 testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Security/CSP) restrictions",
 	"support/csp.php",