docs, kprobes: Update email address of Masami Hiramatsu

According to the latest authorship and Signed-off-by:

  Masami Hiramatsu (Google) <mhiramat@kernel.org>

Masami Hiramatsu is working at Google, so the current email @redhat.com
is out of date, it is better to use the email @kernel.org.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20231219062330.22813-2-yangtiezhu@loongson.cn

Documentation/trace/kprobes.rst

@@ -4,7 +4,7 @@ Kernel Probes (Kprobes)
 
 :Author: Jim Keniston <jkenisto@us.ibm.com>
 :Author: Prasanna S Panchamukhi <prasanna.panchamukhi@gmail.com>
-:Author: Masami Hiramatsu <mhiramat@redhat.com>
+:Author: Masami Hiramatsu <mhiramat@kernel.org>
 
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