VOL-4840 - docs.voltha.org edits

Makefile
patches/python_310_migration.sh
-------------------------------
   o Change log message to note venv patching by version.
   o Original message could be interpreted as explict patching of wrong version.

makefiles/lint/include.mk
-------------------------
   o Document lint targets: usage, commands, makefiles, etc.

Change-Id: I895a0a032f856632c9adf31aa634b6cbf0328cdb
diff --git a/Makefile b/Makefile
index 289559c..908e7b2 100644
--- a/Makefile
+++ b/Makefile
@@ -78,7 +78,7 @@
 ifndef NO_PATCH
 	@echo
 	@echo "========================================"
-	@echo "Applying python 3.10.x migration patches"
+	@echo "Applying python virtualenv patches as needed (v3.10+)"
 	@echo "========================================"
 	./patches/python_310_migration.sh '--venv' "$@" 'apply' 
 endif
@@ -90,10 +90,12 @@
 
 # lint and link verification. linkcheck is part of sphinx
 test: lint linkcheck
+
 # doctest
 # coverage
 # linkcheck
 lint: doc8
+# include $(MAKEDIR)/lint/shell.mk
 
 doc8: $(VENV_NAME) | $(OTHER_REPO_DOCS)
 	source $</bin/activate ; set -u ;\
@@ -189,6 +191,14 @@
 	source $</bin/activate ; set -u ;\
 	$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+BROWSER ?= $(error Usage: $(MAKE) $@ BROWSER=)
+view-html:
+	"$(BROWSER)" _build/html/index.html
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
 include $(MAKEDIR)/help/trailer.mk
 
 # [EOF]