Minor: adding cross references for shard tag methods
Minor: formatting, added comments about types of tag range, typo correction
Add todo linking SERVER-6357
checkpoint
Minor typo
DOCS-1067 clarification of syncdelay
minor: fixing build errors
DOCS-979 updated after finding a comment from Randall

Randall commented in email:

_active is probably more correctly thought of as _started -- things remain active (currently) even when they're yielded. At least in my limited test and understanding of the execution logic. _active only goes back to false during a reset/when the op is done.

I checked in the source and _active will only be set to false
if the op has not started or the op has completed, otherwise it
is always true even if the op has yielded to another op.
merge: DOCS-979
fixing structure of release notes page
minor: fix include statements on sharding include page
Typo, add missing "for"
Various typos and link cleanup related to sharding/replication work
DOCS-120 first draft data center awareness
DOCS-1071: correction
style: fixing code block identification
DOC-988 latex errors with code block within params list
DOCS-988 modifying build system accordingly
theme: minimizing the footer text
build: improving pdf production