patch: minor documentation fix.
patch: minor documentation fix.

Fix @return description of git_patch_num_lines_in_hunk.

stewid/libgit2,stewid/libgit2,Corillian/libgit2,Corillian/libgit2,Corillian/libgit2,Corillian/libgit2,stewid/libgit2,Corillian/libgit2,stewid/libgit2,Corillian/libgit2,stewid/libgit2,stewid/libgit2