Fixed a few header @param and @return typos with the help of -Wdocumentation in Xcode.
The following warnings have not been fixed:
common.h:213 - Not sure how the documentation format is for '...'
notes.h:102 - Correct @param name but empty text
notes.h:111 - Correct @param name but empty text
pack.h:140 - @return missing text
pack.h:148 - @return missing text
git_packbuilder_write() used to write a packfile to the passed file
path. Instead, ask for a destination directory and create both the
packfile and an index, as most users probably do expect.
