Document isDeprecated

Author: wilzbach

spec/grammar.dd

@@ -470,6 +470,7 @@ $(GNAME TraitsKeyword):
     $(TRAITS_LINK2 isArithmetic)
     $(TRAITS_LINK2 isAssociativeArray)
     $(TRAITS_LINK2 isFinalClass)
+    $(TRAITS_LINK2 isDeprecated)
     $(TRAITS_LINK2 isPOD)
     $(TRAITS_LINK2 isNested)
     $(TRAITS_LINK2 isFloating)

spec/traits.dd

@@ -25,6 +25,7 @@ $(GNAME TraitsKeyword):
     $(GBLINK isPOD)
     $(GBLINK isNested)
     $(GBLINK isFuture)
+    $(GBLINK isDeprecated)
     $(GBLINK isFloating)
     $(GBLINK isIntegral)
     $(GBLINK isScalar)
@@ -201,6 +202,11 @@ $(H2 $(GNAME isFuture))
     marked with the `@future` keyword, otherwise `false`. Currently, only
     functions and variable declarations have support for the `@future` keyword.)
 
+$(H2 $(GNAME isDeprecated))
+
+    $(P Takes one argument. It returns `true` if the argument is a symbol
+    marked with the `deprecated` keyword, otherwise `false`.)
+
 $(H2 $(GNAME isVirtualFunction))
 
 	$(P The same as $(GLINK isVirtualMethod), except