DOCS-2947: text to address connection multiplexing
DOCS-2949: downgrade replica set procedure
DOCS-2949: convert authorization downgrade procedure
minor: fixing steps format
minor: adding link.
DOCS-2736 parallelCollectionScan command

Signed-off-by: kay <kay.kim@10gen.com>
DOCS-2736 parallelCollectionScan edits
Update sharding-introduction.txt

typo fix

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-2751 reformat steps: Authenticate Using SASL and LDAP

Signed-off-by: kay <kay.kim@10gen.com>
DOCS-2751 DOCS-2953 ldap/sasl edits
DOCS-2905 rc2 method name change
rename file to fix include
minor: fixing link
BUMP: 2.6.0-rc2
DOCS-2967: adding prefix to indexed items
DOCS-2951 erroneous field names in group command
DOCS-2942: add blank line to correct rendering
DOCS-2645: adding additional cross references
DOCS-2966: moving mongodb-extended-json page to reference section propper
DOCS-2891: clarify which indexes support which queries.