#163: Properly update submodules
#163: update reference to pull code-base
#163: further rewording GIT - update submodules
#163: Add subsection 'GIT Submodule'
Merge pull request #246 from jeff1evesque/doc_local_ignore_rules_for_submodules

#188: Documentation on Local ignore rules
Merge pull request #247 from jeff1evesque/doc_update_submodules

#163: Documentation - Properly update submodules
#188: Minor language change