formuala: update `pour_bottle?` docs

Library/Homebrew/formula.rb

@@ -2920,7 +2920,7 @@ class Formula
     # the {Formula} will be built from source and `reason` will be printed.
     #
     # Alternatively, a preset reason can be passed as a symbol:
-    # <pre>pour_bottle? only_if: :clt</pre>
+    # <pre>pour_bottle? only_if: :clt_installed</pre>
     def pour_bottle?(only_if: nil, &block)
       @pour_bottle_check = PourBottleCheck.new(self)
 

docs/Bottles.md

@@ -68,7 +68,13 @@ A full example:
 
 ```ruby
 pour_bottle? do
-  reason "The bottle needs the Xcode CLT to be installed."
-  satisfy { MacOS::CLT.installed? }
+  reason "The bottle needs to be installed into #{Homebrew::DEFAULT_PREFIX}."
+  satisfy { HOMEBREW_PREFIX.to_s == Homebrew::DEFAULT_PREFIX }
 end
 ```
+
+Commonly used `pour_bottle?` conditions can be added as preset symbols to the `pour_bottle?` method, allowing them to be specified like this:
+
+```ruby
+pour_bottle? only_if: :clt_installed
+```