Links for What's Here sections (#4827)

Makes What's Here sections in Time and Dir link to What's Here for super and included modules (like all the others).

dir.rb

@@ -9,7 +9,13 @@
 #
 # == What's Here
 #
-# \Class \Dir provides methods that are useful for:
+# First, what's elsewhere. \Class \Dir:
+#
+# - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
+# - Includes {module Enumerable}[Enumerable.html#module-Enumerable-label-What-27s+Here],
+#   which provides dozens of additional methods.
+#
+# Here, class \Dir provides methods that are useful for:
 #
 # - {Reading}[#class-Dir-label-Reading]
 # - {Setting}[#class-Dir-label-Setting]

timev.rb

@@ -93,7 +93,12 @@
 #
 # == What's Here
 #
-# \Class \Time provides methods that are useful for:
+# First, what's elsewhere. \Class \Time:
+#
+# - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
+# - Includes {module Comparable}[Comparable.html#module-Comparable-label-What-27s+Here].
+#
+# Here, class \Time provides methods that are useful for:
 #
 # - {Creating \Time objects}[#class-Time-label-Methods+for+Creating].
 # - {Fetching \Time values}[#class-Time-label-Methods+for+Fetching].