DOCS-1157: adding note about mongosniff building
DOCS-739 removing retracted feature
DOCS-982: adding clarification to rs.add method documentation
minor: correction with dbpath on rs tutorials to clarify DOCS-1073
build: minor to fix os x compatibility
DOCS-1044 copy edits
Merge branch 'DOCS-1044-modify-ttl' of github.com:epc/docs into DOCS-1044-modify-ttl

Conflicts:
	source/reference/command/collMod.txt