minor: t7pos and edits for clarity

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1751: fixing typo
DOCS-1750: fixing typo
build: migrating generic steps out of makefile
bootstrap: changing location of tools repo
DOCS-1754: tag set values must be strings
minor: fixing build errors
Update choose-a-shard-key.txt

Fix syntax error at the title.

Signed-off-by: Sam Kleinman <samk@10gen.com>