Clarify documentation for channel and bridge list

This makes it clear that the ARI API calls for listing channels and
bridges will list all channels or bridges in the system and not just
those that are in or are controlled by a Stasis application.

(closes issue ASTERISK-22635)
Reported by: Kevin Harwell


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@401087 65c4cc65-6c06-0410-ace0-fbb531ad65f3

rest-api/api-docs/bridges.json

@@ -13,7 +13,7 @@
 			"operations": [
 				{
 					"httpMethod": "GET",
-					"summary": "List active bridges.",
+					"summary": "List all active bridges in Asterisk.",
 					"nickname": "getBridges",
 					"responseClass": "List[Bridge]"
 				},

rest-api/api-docs/channels.json

@@ -13,7 +13,7 @@
 			"operations": [
 				{
 					"httpMethod": "GET",
-					"summary": "List active channels.",
+					"summary": "List all active channels in Asterisk.",
 					"nickname": "getChannels",
 					"responseClass": "List[Channel]"
 				},