maccess: remove duplicate kerneldoc comments

Many of the maccess routines have a copy of the kerneldoc comment
in the header.  Remove it as it is not useful and will get out of
sync sooner or later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200521152301.2587579-4-hch@lst.de


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>