Fix 3 changelog typos

changelog.dd

@@ -123,7 +123,7 @@ template isIntOrFloat(T)
     static if (is(T == int) || is(T == float))
         enum isIntOrFloat = true;
     else
-        enum isIntOrFloat = true;
+        enum isIntOrFloat = false;
 }
 
 void main()
@@ -375,7 +375,7 @@ template Traits(T) if (is(T == string))
 
 auto func(T, A...)(A args) if (is(T == string))
 {
-    return 1;
+    return 2;
 }
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@@ -671,7 +671,7 @@ unittest
 
 $(LI $(LNAME2 pure_conv_format, $(D std.conv.to) and $(D std.string.format) are now pure functions:))
 
-$(P Since 2.064, pure functions can take advantage of $(D conv) and $(D format). For example:)
+$(P Since 2.064, pure functions can take advantage of $(D to) and $(D format). For example:)
 
 ---------
 import std.conv;