doc: added missing method name "get_keys" under "ngx.shared.DICT" and also fixed the method order. thanks George Bashi for the patch in #404.

Author: agentzh

README.markdown

@@ -5189,10 +5189,11 @@ The resulting object `dict` has the following methods:
 * [add](#ngxshareddictadd)
 * [safe_add](#ngxshareddictsafe_add)
 * [replace](#ngxshareddictreplace)
-* [incr](#ngxshareddictincr)
 * [delete](#ngxshareddictdelete)
+* [incr](#ngxshareddictincr)
 * [flush_all](#ngxshareddictflush_all)
 * [flush_expired](#ngxshareddictflush_expired)
+* [get_keys](#ngxshareddictget_keys)
 
 Here is an example:
 

doc/HttpLuaModule.wiki

@@ -4336,10 +4336,11 @@ The resulting object <code>dict</code> has the following methods:
 * [[#ngx.shared.DICT.add|add]]
 * [[#ngx.shared.DICT.safe_add|safe_add]]
 * [[#ngx.shared.DICT.replace|replace]]
-* [[#ngx.shared.DICT.incr|incr]]
 * [[#ngx.shared.DICT.delete|delete]]
+* [[#ngx.shared.DICT.incr|incr]]
 * [[#ngx.shared.DICT.flush_all|flush_all]]
 * [[#ngx.shared.DICT.flush_expired|flush_expired]]
+* [[#ngx.shared.DICT.get_keys|get_keys]]
 
 Here is an example: