eng: Remove "Generating a Tools Patch"

This section is probably some left over stuff from CVS times.  The topic
is already covered by the "Software Development (Git Users)" section.

eng/coding-gen-patch.rst

@@ -1,35 +0,0 @@
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-.. Copyright (C) 2018.
-.. COMMENT: RTEMS Foundation, The RTEMS Documentation Project
-
-Generating a Tools Patch
-************************
-
-.. COMMENT:TBD - Convert the following to Rest and insert into this file
-.. COMMENT:TBD - https://devel.rtems.org/wiki/Developer/Coding/GenerateAPatch
-
-The RTEMS patches to the development tools are generated using a command like this
-
-.. code block:: shell
-  diff -N -P -r -c TOOL-original-image TOOL-with-changes >PATCHFILE
-
-where the options are:
-
-* -N and -P take care of adding and removing files (be careful not to
-include junk files like file.mybackup)
-
-* -r tells diff to recurse through subdirectories
-* -c is a context diff (easy to read for humans)
-* -u is a unified diff (easy for patch to apply)
-
-Please look at the generated PATCHFILE and make sure it does not contain
-anything you did not intend to send to the maintainers. It is easy to
-accidentally leave a backup file in the modified source tree or have a
-spurious change that should not be in the PATCHFILE.
-
-If you end up with the entire contents of a file in the patch and can't
-figure out why, you may have different CR/LF scheme in the two source
-files. The GNU open-source packages usually have UNIX style CR/LF. If
-you edit on a Windows platform, the line terminators may have been
-transformed by the editor into Windows style.

eng/coding.rst

@@ -16,5 +16,4 @@ TBD  - Write introduction, re-order, identify missing content
     coding-deprecating
     coding-doxygen
     coding-file-hdr
-    coding-gen-patch
     coding-naming