No real changes, just rename double variables to "d".

Don't use "i" or "f" for double variable names, this is confusing, especially
when we do it inconsistently.

See #10625.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73934 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/datstrm.h

@@ -110,9 +110,9 @@ public:
     void Write64(const wxUint64* buffer, size_t size);
 
     /**
-        Writes the double @a f to the stream using the IEEE format.
+        Writes the double @a d to the stream using the IEEE format.
     */
-    void WriteDouble(double f);
+    void WriteDouble(double d);
     /**
         Writes an array of double to the stream. The amount of double to write is
         specified with the @a size variable.