doc: document -i, --include in flux-jobs(1)

Problem: The -i, --include option is not documented in flux-jobs(1).

Document it.

Author: grondo

doc/man1/flux-jobs.rst

@@ -51,6 +51,13 @@ OPTIONS
    List jobs in a specific queue or queues. Multiple queues may be separated
    by a comma or by using the :option:`-q, --queue` option multiple times.
 
+.. options:: -i, --include=HOSTS|RANKS
+
+   List only jobs where the assigned resources intersect with the supplied
+   argument, which may be specified either as an idset of broker ranks or
+   list of hosts in hostlist form. It is not an error to specify ranks or
+   hosts which do not exist.
+
 .. option:: -c, --count=N
 
    Limit output to N jobs (default 1000)