Fix two warnings in eshell.texi

* doc/misc/eshell.texi (Built-ins, Globbing): Fix `.' or `,'
must follow @xref, not `f' warnings.
1 job for emacs-26 in 29 minutes and 36 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #858
test

00:29:36