docs(functions): drop backticks from doc-headers

CONTRIBUTING states doc-headers are written as plain text -- the header
is read as-is by config-help, by funcsave, and by anyone opening the
file, and docs/codespans.py adds the site's inline code spans at render
time. 22 files had drifted from that, carrying 41 hand-written spans
that reached config-help and the man page as literal backtick
characters inside an otherwise verbatim block.

The one span whose content ended in a space is requoted rather than
dropped, so "read> " keeps reading as a prompt string.

functions/jobrunner.fish

@@ -15,13 +15,13 @@
 #   Runs, lists, inspects, re-attaches to, and terminates named background
 #   jobs using tmux or GNU screen as the process engine. Unlike bkg and
 #   detach, which discard output, a jobrunner job keeps a live terminal you
-#   can return to later — it survives closing the shell, and `attach`
+#   can return to later — it survives closing the shell, and attach
 #   restores it in any subsequent session.
 #   Run and manage named background jobs. Jobs are detached from the shell
 #   and backed by tmux (preferred) or GNU screen.
 #
-#   If the job name is omitted when starting a new job (e.g. `jobrunner sleep 1`),
-#   a memorable, random name (like `sleepy-badger`) will be generated.
+#   If the job name is omitted when starting a new job (e.g. jobrunner sleep 1),
+#   a memorable, random name (like sleepy-badger) will be generated.
 #
 # SUBCOMMANDS
 #   run, -r, --run [-n <name>] <cmd> Start a new background job
@@ -49,7 +49,7 @@
 #   Detach from an attached job with Ctrl-A then D; the job keeps running.
 #   Commands are executed directly rather than through a shell, so pipes and
 #   redirections must be wrapped explicitly, e.g.
-#   `jobrunner run sync fish -c 'a | b'`.
+#   jobrunner run sync fish -c 'a | b'.
 function jobrunner --description 'Manage detached background jobs with tmux or GNU screen'
     set -l c_head (set_color --bold cyan)
     set -l c_cmd (set_color --bold)