Update function.dd

Replaced a hard to decipher sentence and added a comment for Uniform Function Call Syntax.

function.dd

@@ -697,7 +697,7 @@ void test() {
 
 
         $(P Functions defined with non-D linkage cannot be overloaded.
-        This is because the name mangling might not take the parameter types
+        because the name mangling does not take the parameter types
         into account.
         )
 
@@ -1845,8 +1845,9 @@ $(H3 $(LNAME2 function-attribute-inference, Function Attribute Inference))
 
 $(H3 $(LNAME2 pseudo-member, Uniform Function Call Syntax (UFCS)))
 
-        $(P D has the ability to replace the access for not present member
-        to the free function call.)
+        $(P A free function can be called with a syntax that looks as if the function
+        were a member function of its first parameter type.
+        )
 
         ---
         void func(X thisObj);
@@ -1857,6 +1858,10 @@ $(H3 $(LNAME2 pseudo-member, Uniform Function Call Syntax (UFCS)))
         // it's automatically rewritten to 'func(obj)'
         ---
 
+	$(P This provides a way to add functions to a class 
+	externally as if they were public final member functions. 
+	)
+
         $(P It also works with $(D @property) functions:)
 
         ---