[VOL-5009] - Create a v2.12 release notes page.

overview/releases.rst
release_notes/index.rst
release_notes/voltha_2.12.rst
-----------------------------
  o Create a skeleton release notes area for v2.12

Change-Id: Ia74075131326e0254af236d9c9edbdf8f46fa430
diff --git a/Makefile b/Makefile
index 0ae2243..7d76ccb 100644
--- a/Makefile
+++ b/Makefile
@@ -62,6 +62,7 @@
 
 ## -----------------------------------------------------------------------
 ## Intent: lint and link verification. linkcheck is part of sphinx
+## See Also: make test-errors
 ## -----------------------------------------------------------------------
 test: lint linkcheck
 
@@ -95,7 +96,7 @@
 	mdl -s $(LINT_STYLE) `find -L $(SOURCEDIR) ! -path "./_$(venv-activate-script)/*" ! -path "./_build/*" ! -path "./repos/*" ! -path "*vendor*" -name "*.md"`
 
 # clean up
-clean:
+clean ::
 	$(RM) -r $(BUILDDIR) $(OTHER_REPO_DOCS) $(STATIC_DOCS)
 
 clean-all sterile :: clean
@@ -182,12 +183,6 @@
  && $(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
 ## -----------------------------------------------------------------------
-## -----------------------------------------------------------------------
-BROWSER ?= $(error Usage: $(MAKE) $@ BROWSER=)
-view-html:
-	"$(BROWSER)" _build/html/index.html
-
-## -----------------------------------------------------------------------
 ## Intent: Display makefile target help
 ## -----------------------------------------------------------------------
 help :: $(venv-activate-script)