Fix invalid example in default repo config as caught by Bad3r

Also mention valid keys for global config

templates/config.edn

@@ -310,7 +310,7 @@
  ;;  :media "[[quick capture]] **{time}**: {url}"}
 
  ;; Quick capture options
- ;; :quick-capture-options {:insert-today? false :redirect-page? false :default-page nil}
+ ;; :quick-capture-options {:insert-today? false :redirect-page? false :default-page "my page"}
 
  ;; File sync options
  ;; Ignore these files when syncing, regexp is supported.

templates/global-config.edn

@@ -1,7 +1,7 @@
-;; This global config file is used by all graphs.
-;; Your graph's logseq/config.edn overrides config keys in this file
-;; except for maps which are merged.
-;; As an example of merging, the following global and local configs:
+;; This global config file applies a configuration to all graphs. Any config
+;; keys from a graph's logseq/config.edn can used here. A graph's
+;; logseq/config.edn overrides config keys in this file except for maps which
+;; are merged. As an example of merging, the following global and local configs:
 ;;   {:shortcuts {:ui/toggle-theme "t z"}}
 ;;   {:shortcuts {:ui/toggle-brackets "t b"}}
 ;;