data: Add useful sample of removal syntax in mfshdd.cfg
mount: Do minor spelling corrections
doc: Fix sample "mfstopology.cfg" file

Apparently master doesn't like empty lines in "mfstopology.cfg" -- for each
empty line it logs

    mfstopology: incomplete definition in line: N

This commit replaces empty lines with comments in sample conf file
to reduce noise.

Closes: #199
doc: Add "mfsmetadump.8" and "mfsrestoremaster.8" man pages