pidgin/pidgin

Add some missed docs for PidginCredential*

2021-05-13, Elliott Sales de Andrade
7e8c50c967bc
Add some missed docs for PidginCredential*

* Add `Since` tags for `PidginCredential`.
* Add docs for `PidginCredential*` top-level API.

Testing Done:
Compile

Reviewed at https://reviews.imfreedom.org/r/651/
---
name: gplugin
buildsystem: meson
config-opts:
- -Ddoc=false
- -Dlua=false
- -Dperl=false
sources:
- type: archive
url: https://keep.imfreedom.org/gplugin/gplugin/archive/ed8e701cc2b1.tar.gz
sha256: ad7968d0d5d93ba39c2d6676f612cfd2f353260b9e4d260d0dac17c52f833f8d
cleanup:
- /bin
- /include
- /lib/pkgconfig
- /share/man