man page checker: enforce stricter options format

Followup to #14906, in which a nonexistent option was found
in a man page. The xref script was designed to catch that,
but I was too lax in my parsing: the option was documented
using wrong syntax, and the script didn't catch it.

Solution: do not allow *any* unrecognized cruft in the
option description lines. And fix all improperly-written
entries to conform to the rule:

    **--option**=*value(s)*

Two asterisks around option, which must have two dashes. One
asterisk around value(s).

This is going to cause headaches for some people adding new
options, but I don't think I can fix that: there are many
factors that make an unparseable line. Adding 'hint' code
would make the script even more complex than it is. I have
to assume that our contributors are smart enough to look
at surrounding context and figure out the right way to
specify options.

Signed-off-by: Ed Santiago <santiago@redhat.com>

<MH: Fixed cherry-pick conflicts>

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/source/markdown/podman-machine-info.1.md b/docs/source/markdown/podman-machine-info.1.md
index 33c207d32..926d3d8b3 100644
--- a/docs/source/markdown/podman-machine-info.1.md
+++ b/docs/source/markdown/podman-machine-info.1.md
@@ -13,7 +13,7 @@ Rootless only, as all `podman machine` commands can be only be used with rootles
 
 ## OPTIONS
 
-#### **--format**=*format*, **-f**
+#### **--format**, **-f**=*format*
 
 Change output format to "json" or a Go template.