Adjust auto_explain's GUC descriptions.
This commit adjusts auto_explain's GUC descriptions to follow the
style guidelines established by commit
977d865c36. Specifically,
it ensures the accepted special values are listed in a consistent
manner.
Author: Ilia Evdokimov <ilya.evdokimov@tantorlabs.com>
Reviewed-by: Peter Smith <smithpb2250@gmail.com>
Discussion: https://postgr.es/m/
e82d4647-ce7f-45c7-9b01-
fb900a050767%40tantorlabs.com