doc: Remove gulp references

Signed-off-by: jason taylor <jtfas90@gmail.com>

doc/userguide/README.md

@@ -5,16 +5,10 @@ This directory contains the Suricata Guide. The
 documentation. For a primer os reStructuredText see the
 [reStructuredText Primer](http://sphinx-doc.org/rest.html).
 
-## Development Server
+## Verifying Changes
 
-To help with writing documentation there is a development web server
-with live reload. To get run the live server you will first need npm
-installed then run the following:
+There are a number of output formats to choose from when making the source documentation locally (e.g. html, pdf, man).
 
-	npm install
-	gulp serve
+The documentation source can be built with `make -f Makefile.sphinx html`. Substitute the 'html' word for desired output format.
 
-Then point your browser at http://localhost:8000/_build/html/index.html
-
-Any edits to .rst files should trigger a "make html" and cause your
-browser to refresh.
+There are different application dependencies based on the output desired.