trace doc: correct names of varous tracing documents

Some documents were converted from the plain text documentation
to reStructuredText format; update references to match.

Signed-off-by: Manbing <manbing3@gmail.com>
Link: https://lore.kernel.org/r/20200630185356.3467-1-manbing3@gmail.com


Signed-off-by: Jonathan Corbet <corbet@lwn.net>