Update docs.

[ci skip]

Author: XhmikosR

docs/uglify-examples.md

@@ -204,7 +204,7 @@ grunt.initConfig({
     options: {
       compress: {
         global_defs: {
-          "DEBUG": false
+          'DEBUG': false
         },
         dead_code: true
       }

docs/uglify-options.md

@@ -127,13 +127,13 @@ Turn on preservation of comments.
 Type: `String`  
 Default: `''`
 
-This string will be prepended to the minified output.  Template strings (e.g. `<%= config.value %>` will be expanded automatically.
+This string will be prepended to the minified output. Template strings (e.g. `<%= config.value %>` will be expanded automatically.
 
 ## footer
 Type: `String`  
 Default: `''`
 
-This string will be appended to the minified output.  Template strings (e.g. `<%= config.value %>` will be expanded automatically.
+This string will be appended to the minified output. Template strings (e.g. `<%= config.value %>` will be expanded automatically.
 
 ## screwIE8
 Type: `Boolean`