- Improved documentation.

doc/neocomplcache-snippets-complete.txt

@@ -176,8 +176,11 @@ Example:
 	        ${2}
 	    endif
 <
-By the way, it is warned that the snippet name is already defined by same snippet file.
+snippet {snippet_name} syntax is the snippet name.
-When you want to overwrite explicitly, as follows:
+abbr {abbr_name} is the completion abbrevation (same to completion "abbr" key).
+prev_word '^' means this snippet is enabled only in line head.
+By the way, it is warned that the snippet name is already defined by same
+snippet file.  When you want to overwrite explicitly, as follows:
 >
 	delete snippets_name
 <
@@ -278,6 +281,9 @@ snippet						*neocomplcache-snippets-complete-unite-action-snippet*
 ==============================================================================
 CHANGELOG					*neocomplcache-snippets-complete-changelog*
 
+2012-02-21
+- Improved documentation.
+
 2012-02-05
 - Fixed variable name.