Merge branch 'mm/usage-log-l-can-take-regex'

Documentation fix.

* mm/usage-log-l-can-take-regex:
log -L: improve error message on malformed argument
Documentation: change -L:<regex> to -L:<funcname>

diff --cc Documentation/blame-options.txt
Simple merge

diff --cc Documentation/git-log.txt
Simple merge

diff --cc line-log.c
Simple merge