docs: Update Transifex links

doc/developer-notes.md

@@ -144,7 +144,7 @@ For example, to describe a function use:
  */
 bool function(int arg1, const char *arg2)
 ```
-A complete list of `@xxx` commands can be found at http://www.stack.nl/~dimitri/doxygen/manual/commands.html.
+A complete list of `@xxx` commands can be found at http://www.doxygen.nl/manual/commands.html.
 As Doxygen recognizes the comments by the delimiters (`/**` and `*/` in this case), you don't
 *need* to provide any commands for a comment to be valid; just a description text is fine.
 
@@ -185,7 +185,7 @@ Not OK (used plenty in the current source, but not picked up):
 //
 ```
 
-A full list of comment syntaxes picked up by Doxygen can be found at https://www.stack.nl/~dimitri/doxygen/manual/docblocks.html,
+A full list of comment syntaxes picked up by Doxygen can be found at http://www.doxygen.nl/manual/docblocks.html,
 but the above styles are favored.
 
 Documentation can be generated with `make docs` and cleaned up with `make clean-docs`. The resulting files are located in `doc/doxygen/html`; open `index.html` to view the homepage.