master
meson: build Linux-PAM using meson
doc: Update PAM documentation from DockBook 4 to DocBook 5
treewide: fix typos in comments and documentation
pam.8: Drop self reference
manual pages: enhance pam.d documentation
pam_get_authtok*: disallow setting pamh to NULL
doc: fix pam_get_data manual regarding PAM_NO_MODULE_DATA return value
manual pages: document usage of $DISPLAY and PAM_TTY
man: clarify PAM_DATA_SILENT in pam_set_data.3