Improve descriptions of `lyric.set_hold_time` action and field (#139385)

* Fix misleading descriptions on lyric.set_hold_time action

While on Honeywell Lyric thermostats the user can set a "Hold Until" time of day, the set_hold_time action does define a time period instead (Example: 01:00:00)

Therefore both descriptions are incorrectly using "until" for explaining the purpose of the action itself and the `time_period` field. 

This commit re-words both and adds some additional context that helps users (and translators) better understand this action and its purpose.

In addition the action name is changed to proper sentence-casing.

* Replace "time" with "duration" for additional clarity

homeassistant/components/lyric/strings.json

@@ -53,12 +53,12 @@
   },
   "services": {
     "set_hold_time": {
-      "name": "Set Hold Time",
+      "name": "Set hold time",
-      "description": "Sets the time to hold until.",
+      "description": "Sets the time period to keep the temperature and override the schedule.",
       "fields": {
         "time_period": {
-          "name": "Time Period",
+          "name": "Time period",
-          "description": "Time to hold until."
+          "description": "Duration for which to override the schedule."
         }
       }
     }