doc: typo fix from Lance Li.

README.markdown

@@ -2912,7 +2912,7 @@ Here is a basic example:
  res = ngx.location.capture(uri)
 ```
 
-Returns a Lua table with three slots (`res.status`, `res.header`, `res.body`, and `res.truncated`).
+Returns a Lua table with 4 slots: `res.status`, `res.header`, `res.body`, and `res.truncated`.
 
 `res.status` holds the response status code for the subrequest response.
 

doc/HttpLuaModule.wiki

@@ -2349,7 +2349,7 @@ Here is a basic example:
     res = ngx.location.capture(uri)
 </geshi>
 
-Returns a Lua table with three slots (<code>res.status</code>, <code>res.header</code>, <code>res.body</code>, and <code>res.truncated</code>).
+Returns a Lua table with 4 slots: <code>res.status</code>, <code>res.header</code>, <code>res.body</code>, and <code>res.truncated</code>.
 
 <code>res.status</code> holds the response status code for the subrequest response.