Update clang.txt

doc/clang.txt

@@ -21,7 +21,7 @@ CONFIG                                          *clang-config*
 
 Vim-clang uses a file named ".clang" (same as .clang_complete for clang_complete)
 in the project root to save Clang options. Relative path is recommended when
-configure the include directory, so we can move the project anywhere...
+configure the include directory, so we can move the project to anywhere...
 Here is a tree to show the location of file '.clang'
 .
 ├── build/
@@ -37,16 +37,16 @@ Here is a tree to show the location of file '.clang'
 └── yacl/
 
 The file ".clang" only contains: "-I." to include files in directory "./".
-So that the source file should uses #include "yacl/xxx.h" to include files.
+So that the source file should use #include "yacl/xxx.h" to include files.
 
 Now a new similar file named ".clang.ow" is added to deal with the special
 case that one want to overwrite all clang options, which means the one don't
 need automatically generated options for clang by the plugin.
 See |g:clang_dotfile_overwrite| for more details.
 
 Please note that all options in ".clang" and ".clang.ow" must be safe
-to be used by 'shell', that means special chars should always be escaped
-correctly. See |shellescape()| for more details.
+to be used by the 'shell', that means special chars should always be 
+escaped correctly. See |shellescape()| for more details.
 
 ==============================================================================
 VARIABLES                                       *clang-variables*
@@ -96,14 +96,14 @@ g:clang_dotfile                         *g:clang_dotfile*
 <
 g:clang_dotfile_overwrite               *g:clang_dotfile_overwrite*
         Same as |g:clang_dotfile| but has higher priority than it.
-        Options in |g:clang_dotfile| will be append to discovered
+        Options in |g:clang_dotfile| will be appended to discovered
         options that from |g:clang_c_options|, |g:clang_cpp_options|
         and |g:clang_include_sysheaders|. But if |g:clang_dotfile_overwrite|
         file is exist, plugin will not do the discovery anymore, only add
         the minimum of options and append |g:clang_dotfile_overwrite|
-        to them to before calling clang.
+        to them before calling clang.
         Note: This is very useful if you are doing some cross-platform
-        projects, they may have different include directory and options.
+        projects, they may have different include directories and options.
     Default: >
         let g:clang_dotfile_overwrite = '.clang.ow'
 <
@@ -174,7 +174,7 @@ g:clang_stdafx_h                        *g:clang_stdafx_h*
 <
 g:clang_vim_exec                        *g:clang_vim_exec*
         Name or path of executable vim.
-        Note: This is option is used in async mode to startup a new vim
+        Note: This option is used in async mode to startup a new vim
         process. Please add vim to your system PATH or overwrite this var.
         Attention that default the command 'vim' will not act as a server,
         instead you must add '--servername XX' to start a unique server.
@@ -235,7 +235,7 @@ CHANGELOG                                        *clang-changelog*
 ==============================================================================
 CREDITS                                          *clang-credits*
 
-Thanks to the following people for suggestions and patches:
+Thanks to following people for suggestions and patches:
 * RageCooky
 * wookayin
 * yuquan23459