docs: man: fix wrong escapes (#6474)

Remove extranous escape characters and fix bold escaping.

Command used to check for unusual escape sequences:

    $ git grep -E -e '\\f[^BR]' -e '\\[^ "\f-]' -- src/man/*.in

With this, the only escape sequences used are:

    $ git grep -E -ho -e '\\-' -e '\\[^-][^ ]?' -- src/man/*.in |
      LC_ALL=C sort | uniq -c
          9 \"
          1 \&.
       1194 \-
         23 \\
        507 \fB
        127 \fR

Related commits:

* 1379851 ("Baseline firejail 0.9.28", 2015-08-08)
* 1684c9e ("Fixes for man firejail (#2628)", 2019-03-29)
* 7352501 ("Clarify that file globbing occurs only at start",
  2020-04-11) / PR #3347
* f54ee53 ("man text for --include command", 2021-03-05).

This is a follow-up to #6472.

Kind of relates to #5903.

src/man/firejail-profile.5.in

@@ -243,7 +243,7 @@ host filesystem. Each line describes a file/directory that is inaccessible
 a tmpfs mounted on top of an existing directory (\fBtmpfs\fR),
 or mount-bind a directory or file on top of another directory or file (\fBbind\fR).
 Use \fBprivate\fR to set private mode.  File globbing is supported, and PATH and
-HOME directories are searched, see the \fBfirejail\f(1) \fBFILE GLOBBING\fR section
+HOME directories are searched, see the \fBfirejail\fR(1) \fBFILE GLOBBING\fR section
 for more details.
 Examples:
 .TP

src/man/firejail.1.in

@@ -951,7 +951,7 @@ $ firejail \-\-ignore="net eth0" firefox
 #endif
 
 .TP
-\fB\-\-\include=file.profile
+\fB\-\-include=file.profile
 Include a profile file before the regular profiles are used.
 .br
 
@@ -1018,7 +1018,7 @@ in case you intend to start an external DHCP client in the sandbox.
 .br
 Example:
 .br
-$ firejail \-\-net=eth0 \-\-\ip=none
+$ firejail \-\-net=eth0 \-\-ip=none
 .br
 
 .br
@@ -1070,7 +1070,7 @@ default gateway is assigned by default.
 .br
 Example:
 .br
-$ firejail \-\-net=eth0 \-\-\iprange=192.168.1.100,192.168.1.150
+$ firejail \-\-net=eth0 \-\-iprange=192.168.1.100,192.168.1.150
 
 .TP
 \fB\-\-ipc-namespace
@@ -3453,37 +3453,37 @@ $ firejail --tree
       1221:netblue:/usr/lib/firefox/firefox
 .RE
 
-We provide a tool that automates all this integration, please see \&\flfirecfg\fR\|(1) for more details.
+We provide a tool that automates all this integration, please see \fBfirecfg\fR(1) for more details.
 
 .SH EXAMPLES
 .TP
-\f\firejail
+\fBfirejail
 Sandbox a regular shell session.
 .TP
-\f\firejail firefox
+\fBfirejail firefox
 Start Mozilla Firefox.
 .TP
-\f\firejail \-\-debug firefox
+\fBfirejail \-\-debug firefox
 Debug Firefox sandbox.
 .TP
-\f\firejail \-\-private firefox
+\fBfirejail \-\-private firefox
 Start Firefox with a new, empty home directory.
 .TP
-\f\firejail --net=none vlc
+\fBfirejail --net=none vlc
 Start VLC in an unconnected network namespace.
 #ifdef HAVE_NETWORK
 .TP
-\f\firejail \-\-net=eth0 firefox
+\fBfirejail \-\-net=eth0 firefox
 Start Firefox in a new network namespace. An IP address is
 assigned automatically.
 .TP
-\f\firejail \-\-net=br0 \-\-ip=10.10.20.5 \-\-net=br1 \-\-net=br2
+\fBfirejail \-\-net=br0 \-\-ip=10.10.20.5 \-\-net=br1 \-\-net=br2
 Start a shell session in a new network namespace and connect it
 to br0, br1, and br2 host bridge devices. IP addresses are assigned
 automatically for the interfaces connected to br1 and b2
 #endif
 .TP
-\f\firejail \-\-list
+\fBfirejail \-\-list
 List all sandboxed processes.
 
 .SH FILE GLOBBING