doc: drop flux_child_watcher_create(3)

Problem: child watchers are removed from the public API but
man pages remain.

Drop man pages.

Author: garlick

doc/Makefile.am

@@ -119,7 +119,6 @@ MAN3_FILES_PRIMARY = \
 	man3/flux_msg_cmp.3 \
 	man3/flux_msg_create.3 \
 	man3/flux_msg_handler_addvec.3 \
-	man3/flux_child_watcher_create.3 \
 	man3/flux_signal_watcher_create.3 \
 	man3/flux_stat_watcher_create.3 \
 	man3/flux_respond.3 \
@@ -222,8 +221,6 @@ MAN3_FILES_SECONDARY = \
 	man3/flux_msg_handler_stop.3 \
 	man3/flux_get_handle_watcher.3 \
 	man3/flux_msg_handler_delvec.3 \
-	man3/flux_child_watcher_get_rpid.3 \
-	man3/flux_child_watcher_get_rstatus.3 \
 	man3/flux_signal_watcher_get_signum.3 \
 	man3/flux_stat_watcher_get_rstat.3 \
 	man3/flux_respond_raw.3 \

doc/man3/flux_child_watcher_create.rst

@@ -75,9 +75,6 @@
     ('man3/flux_attr_get', 'flux_attr_get', 'get/set Flux broker attributes', [author], 3),
     ('man3/flux_aux_set', 'flux_aux_get', 'get/set auxiliary handle data', [author], 3),
     ('man3/flux_aux_set', 'flux_aux_set', 'get/set auxiliary handle data', [author], 3),
-    ('man3/flux_child_watcher_create', 'flux_child_watcher_get_rpid', 'create child watcher', [author], 3),
-    ('man3/flux_child_watcher_create', 'flux_child_watcher_get_rstatus', 'create child watcher', [author], 3),
-    ('man3/flux_child_watcher_create', 'flux_child_watcher_create', 'create child watcher', [author], 3),
     ('man3/flux_core_version', 'flux_core_version_string', 'get flux-core version', [author], 3),
     ('man3/flux_core_version', 'flux_core_version', 'get flux-core version', [author], 3),
     ('man3/flux_event_decode', 'flux_event_decode_raw', 'encode/decode a Flux event message', [author], 3),