Amend filters searches to explicitly use plex_search or plex_all

docs/metadata/filters.md

@@ -201,6 +201,8 @@ A few examples are listed below:
 ```yaml
 collections:
   1080p Documentaries:
+    plex_search:
+      all:
         genre: Documentary
     summary: A collection of 1080p Documentaries
     filters:
@@ -216,6 +218,8 @@ collections:
 ```yaml
 collections:
   French Romance:
+    plex_search:
+      all:
         genre: Romance
     filters:
       audio_language: Français
@@ -223,6 +227,8 @@ collections:
 ```yaml
 collections:
   Romantic Comedies:
+    plex_search:
+      all:
         genre: Romance
     filters:
       genre: Comedy
@@ -253,6 +259,7 @@ collections:
 collections:
   Good Adam Sandler Romantic Comedies:
     plex_search:
+      all:
         genre: Romance
         actor: Adam Sandler
     filters:
@@ -262,7 +269,7 @@ collections:
 ```yaml
 collections:
   Movies with Commentary:
-    plex: all
+    plex_all: true
     filters:
       audio_track_title: Commentary
 ```