[close #610] [to #590] add docs for api v2 and tls reload#611

iosmanthus merged 6 commits intotikv:mastertikv/client-java:masterfrom

iosmanthus:add-docs-for-api-v2-and-tls-reloadiosmanthus/client-java:add-docs-for-api-v2-and-tls-reloadCopy head branch name to clipboard