Address clang warning: extra ';' after member function definition [-Wextra-semi]

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10901 387891d4-d844-0410-90c0-e4c51a9137d3
Address clang warning: parameter [x] not found in the function declaration [-Wdocumentation]

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10902 387891d4-d844-0410-90c0-e4c51a9137d3
Address clang warning: unknown command tag name 'brieft'; did you mean 'brief'? [-Wdocumentation]

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10903 387891d4-d844-0410-90c0-e4c51a9137d3
Address clang warning: parameter 'x,' not found in the function declaration [-Wdocumentation]

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10904 387891d4-d844-0410-90c0-e4c51a9137d3