Update http_response documentation

plugins/inputs/http_response/README.md

-# Example Input Plugin
+# HTTP Response Input Plugin
 
-This input plugin will test HTTP/HTTPS connections.
+This input plugin checks HTTP/HTTPS connections.
 
 ### Configuration:
 
@@ -41,27 +41,25 @@ This input plugin will test HTTP/HTTPS connections.
   #   Host = "github.com"
 ```
 
-### Measurements & Fields:
+### Metrics:
 
 - http_response
-    - response_time (float, seconds) # Not set if target is unreachable for any reason
-    - http_response_code (int) # The HTTP code received
-	- result_type (string) # Legacy field mantained for backwards compatibility
-    - result_code (int) # Details [here](#result-tag-and-result_code-field)
+  - tags:
+    - server (target URL)
+    - method (request method)
+    - status_code (response status code)
+    - result ([see below](#result--result_code))
+  - fields:
+    - response_time (float, seconds)
+    - http_response_code (int, response status code)
+	- result_type (string, deprecated in 1.6: use `result` tag and `result_code` field)
+    - result_code (int, [see below](#result--result_code))
+
+#### `result` / `result_code`
 
-
-### Tags:
-
-- All measurements have the following tags:
-    - server # Server URL used
-    - method # HTTP method used (GET, POST, PUT, etc)
-    - status_code # String with the HTTP status code
-    - result # Details [here](#result-tag-and-result_code-field)
-
-### Result tag and Result_code field
 Upon finishing polling the target server, the plugin registers the result of the operation in the `result` tag, and adds a numeric field called `result_code` corresponding with that tag value.
 
-This tag is used to expose network and plugin errors. HTTP errors are considered a sucessful connection by the plugin.
+This tag is used to expose network and plugin errors. HTTP errors are considered a successful connection.
 
 |Tag value                |Corresponding field value|Description|
 --------------------------|-------------------------|-----------|
@@ -72,10 +70,9 @@ This tag is used to expose network and plugin errors. HTTP errors are considered
 |timeout                  | 4                       |The plugin timed out while awaiting the HTTP connection to complete|
 |dns_error                | 5                       |There was a DNS error while attempting to connect to the host|
 
-NOTE: The error codes are derived from the error object returned by the `net/http` Go library, so the accuracy of the errors depends on the handling of error states by the `net/http` Go library. **If a more detailed error report is required use the `log_network_errors` setting.**
 
 ### Example Output:
 
 ```
-http_response,method=GET,server=http://www.github.com,status_code="200",result="success" http_response_code=200i,response_time=6.223266528,result_type="sucess",result_code=0i 1459419354977857955
+http_response,method=GET,server=http://www.github.com,status_code=200,result=success http_response_code=200i,response_time=6.223266528,result_type="success",result_code=0i 1459419354977857955
 ```