Fix README errors

Author: tiagofumo

README.md

@@ -92,22 +92,22 @@ let g:NERDTreeSyntaxDisableDefaultExtensions = 1
 let g:NERDTreeSyntaxEnabledExtensions = ['hbs', 'lhs'] " enable highlight to .hbs and .lhs files with default colors
 ```
 ### Mitigating lag issues
-Some users are reporting they feel some lag when using this plugin. There are ways to mitigate this lag. One way is to disable most of the the default highlight exntensions. The code is going to color over than 80 extensions by default, even if you are not using these extensions. One easy way to do it is use the limited syntax mode:
+Some users are reporting they feel some lag when using this plugin. There are ways to mitigate this lag. One way is to disable most of the the default highlight exntensions. The code is going to color over than 80 extensions by default, even if you are not using most of them. One easy way to do this is using the limited syntax mode:
 ```vim
 let g:NERDTreeLimitedSyntax = 1
 ```
-This configuration will limit the number of extensions used to these:
+This configuration will limit the extensions used to these:
 ```
 .bmp, .c, .coffee, .cpp, .css, .erb, .go, .hs, .html, .java, .jpg, .js, .json, .jsx, .less, .lua, .markdown, .md, .php, .png, .pl, .py, .rb, .rs, .scala, .scss, .sh, .sql, .vim
 ```
-If this doens't solve your lag, or doesn't include the extensions you use, you can choose the exntensions you want to enable. For example, if you work with C, php, ruby and javascript, you could add something like this to your `.vimrc` instead:
+If this doens't solve your lag, or doesn't include the extensions you normaly use, you can choose the extensions you want to enable. For example, if you work with C, php, ruby and javascript, you could add something like this to your `.vimrc` instead:
 ```vim
 let g:NERDTreeSyntaxDisableDefaultExtensions = 1
 let g:NERDTreeDisableExactMatchHighlight = 1
 let g:NERDTreeDisablePatternMatchHighlight = 1
 let g:NERDTreeSyntaxEnabledExtensions = ['c', 'h', 'c++', 'php', 'rb', 'js', 'css'] " example
 ```
-A user reported that disabling `Cursorline` highlight from NERDTree fixed the issue. You can do this by adding this to your `.vimrc`
+A user reported that disabling `Cursorline` highlight from NERDTree fixed the issue. You can do this by adding this configuration to your `.vimrc`:
 ```vim
 let g:NERDTreeHighlightCursorline = 0
 ```