Docs: fix various typos

Closes gh-1872

Author: David Hirtle

OVERVIEW.md

@@ -150,7 +150,7 @@ jscs path[ path[...]] --preset=jquery
 In order to add/remove preset rules you will need to create a `.jscsrc` config file.
 
 ### `--extract`
-With this option you can set glob pattern for files which embeded JavaScript should be checked.
+With this option you can set glob pattern for files which embedded JavaScript should be checked.
 ```
 jscs path[ path[...]] --extract *.html
 ```
@@ -297,13 +297,13 @@ Values: A single file extension or an Array of file extensions, beginning with a
 
 ### extract
 
-Set list of glob patterns for files which embeded JavaScript should be checked.
+Set list of glob patterns for files which embedded JavaScript should be checked.
 
 Type: `Array` or `Boolean`
 
 Values: Array of file matching patterns
 
-JavaScript extracting from files that doesn't match to [fileExtensions](#fileExtensions) or [excludeFiles](#excludefiles), but match to patterns in this list. Currenly, only `html` format is supported.
+JavaScript extracting from files that doesn't match to [fileExtensions](#fileExtensions) or [excludeFiles](#excludefiles), but match to patterns in this list. Currently, only `html` format is supported.
 
 #### Example
 
@@ -420,7 +420,7 @@ See [how to define an error filter](https://github.com/jscs-dev/node-jscs/wiki/E
 
 ### Disabling a Rule
 
-You can specifically disable any rule by ommitting it from your `.jscsrc` config or by assigning it to null, like so:
+You can specifically disable any rule by omitting it from your `.jscsrc` config or by assigning it to null, like so:
 ```json
 {
     "preset": "jquery",

lib/utils.js

@@ -65,8 +65,8 @@ exports.isSnakeCased = function(name) {
 };
 
 /**
- * Returns the function expression node if the provided node is an iffe,
- * other returns undefined.
+ * Returns the function expression node if the provided node is an IIFE,
+ * otherwise returns null.
  *
  * @param  {Object} node
  * @return {?Object}

test/scripts/integration.js

@@ -19,7 +19,7 @@ vowFs.listDir('./presets')
         // List of rules that are not used in any of the default presets
         presets.unshift('./test/scripts/forgotten-rules.json');
 
-        console.log('\n' + chalk.green('> ') + 'Autofix ingeration tests');
+        console.log('\n' + chalk.green('> ') + 'Autofix integration tests');
 
         return promiseQueue(presets, function(presetName) {
             console.log('\nPreset "' + chalk.green(presetName) + '"');