DOCS-795 max number of docs in a capped collection
DOCS-795 review edits
DOCS-795 added version reference
Resident memory is in MB

This seems to have been missed in the edits related to https://jira.mongodb.org/browse/DOCS-741.
DOCS-1056: fixing cross referencing of operators and projection operators
cross referencing fixing, operators
DOCS-916: adding warning
DOCS-916: corrections and additional admonitions
minor: reorganization of a replication internals section
merge: DOCS-795 and edits

Merge remote-tracking branch 'bgrabar/capped-coll-limit-795'
DOCS-1014 add cursor.objsLeftInBatch
capped collections clarification
merge: DOCS-1014
DOCS-1014: edits
updates to tag aware sharding documents
Merge branch 'master' of git://github.com/mongodb/docs