doc: more typo fixes.

Author: agentzh

doc/HttpLuaModule.wiki

@@ -3793,7 +3793,7 @@ or a Lua table holding the query arguments' key-value pairs, as in
 
 In the former case, i.e., when the whole query-string is provided directly,
 the input Lua string should already be well-formed with the URI encoding.
-For security considerations, his method will automatically escape any control and
+For security considerations, this method will automatically escape any control and
 whitespace characters (ASCII code 0x00 ~ 0x32 and 0x7F) in the Lua string.
 
 In the latter case, this method will escape argument keys and values according to the URI escaping rule.