instrumented.h: Fix all kernel-doc format warnings

Fix 26 kernel-doc notation warnings by converting the function
documentation to kernel-doc format.

Warning example:

instrumented.h:155: warning: Function parameter or member 'to' not described in 'instrument_copy_from_user_after'
instrumented.h:155: warning: Function parameter or member 'from' not described in 'instrument_copy_from_user_after'
instrumented.h:155: warning: Function parameter or member 'n' not described in 'instrument_copy_from_user_after'
instrumented.h:155: warning: Function parameter or member 'left' not described in 'instrument_copy_from_user_after'

Fixes: 36e4d4dd ("include/linux: Add instrumented.h infrastructure")
Fixes: 00047c2e ("instrumented.h: Introduce read-write instrumentation hooks")
Fixes: 33b75c1d ("instrumented.h: allow instrumenting both sides of copy_from_user()")
Fixes: 888f84a6 ("x86: asm: instrument usercopy in get_user() and put_user()")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>