[HACKERS] Incorrect mention of pg_xlog_switch() in xlogfuncs.c

While reading some code, noticed that the headers of functions
pg_walfile_name_offset() and pg_walfile_name() incorrecty refer
pg_xlog_switch() since the inception of code in commit 704ddaaa.

In PG10 implementation, actual name of the referred function is
pg_switch_wal(). So either refer the correct name in the function
header or remove the other function referral from the function header.

Attaching patches for both the ways.
-- 
Regards,
Neha

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