libmount: allow unspecified source on remount

kernel does not require mount source (e.g. device name) on remount, it
means that fstab/mtab/mountinfo should be optional in this case.
For example:

 mount -o rw,remount /

has to work on system without mounted /proc.

Signed-off-by: Karel Zak <kzak@redhat.com>
login: Fix unused variables in login.c if _HAVE_UT_TV isn't defined

Wrap around the variable declaration for `tv' with ifdef so the compilers
don't warn about unused variables if we're compiling without UT_TV. This
happens with the musl libc, since it doesn't define _HAVE_UT_TV, even
though it _does_ have the ut_tv field in the utmp struct.

Signed-off-by: Will Johansson <will.johansson@gmail.com>
docs: fix the grammar of the recent comment about comments

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
textual: do not start option descriptions with a capital

This normalizes the help text of getopt, clarifies one description,
and also adjust two comments.

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
docs: improve the sorting of the options in the man page of getopt

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
docs: don't use bold or italics for "[option]" in synopsis of man pages

As per the convention shown in Documentation/howto-man-page.txt.
Also make a few other tiny adjustments along the way.

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
docs: adjust the grammar, text, sorting and formatting of logger man page

The message argument is not an option and should not be listed among
those.  Describe the optional argument of --rfc5424 better.  Use the
= and no space for optional option arguments.  Don't italicize words
unnecessarily.  Use bold for literal things.  And sort the options
alphabetically (apart from -V and -h).

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
docs: adjust some formatting and wordings in a handful of man pages

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
docs: fix the grammar and formatting in the man page of sfdisk

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
sfdisk: in the usage text show -v for --version instead of -V

In sfdisk -V is taken by --verify.  Use for the description of --version
the same indentation as for --help, not that of the other options.

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>