Doc updates.
* jh/partial-clone-doc:
partial-clone: render design doc using asciidoc
TECH_DOCS += technical/pack-format
TECH_DOCS += technical/pack-heuristics
TECH_DOCS += technical/pack-protocol
+ TECH_DOCS += technical/partial-clone
TECH_DOCS += technical/protocol-capabilities
TECH_DOCS += technical/protocol-common
+TECH_DOCS += technical/protocol-v2
TECH_DOCS += technical/racy-git
TECH_DOCS += technical/send-pack-pipeline
TECH_DOCS += technical/shallow