docs/develop: Delete "How to Merge Patches from NetBSD Trunk".

This is now obsolete as the preferred merge strategy is just to
copy the whole directories and then reinstate the __HAIKU__
directives, same as for the FreeBSD network drivers and other
such code.

docs/develop/net/HowTo-Synchronize_with_NetBSD.rst

@@ -1,36 +0,0 @@
-How to Merge Patches from NetBSD Trunk
-======================================
-
-Using the NetBSD CVS is a pain, so instead, the preferred thing to do is
-to use `the official Git mirror <https://github.com/NetBSD/src>`__. The
-code here is in the tree at a few places:\ ``inet`` is at
-``lib/libc/inet``, irs is scattered across the tree, and ``resolv`` is
-at ``lib/libc/resolv``.
-
-The preferable way to merge is to take the last commit merged from IIJ’s
-mirror (can be found in the merging commit in Haiku, if the merger has
-done their work properly) and check all commits since then to see if
-they apply or not (some apply to documentation we don’t have, etc.)
-Cherry-pick the ones that do, and download them as git-format-patch
-patches (by adding ``.patch`` onto the end of the commit URL).
-
-To convert the patches to have the correct paths to the resolv/inet/etc.
-code, use ``sed``:
-
-::
-
-   sed s%lib/libc/resolv%src/kits/network/netresolv/resolv%g -i *.patch
-
-(You’ll need to use similar commands for the ``inet`` and ``irs`` code.)
-
-Then apply the patches using ``git apply --reject file.patch``. Git will
-spew a lot of errors about files in the patch that aren’t in the tree,
-and then it will warn that some hunks are being rejected. Review the
-rejected hunks **VERY CAREFULLY**, as some code in Haiku’s NetResolv is
-not in NetBSD’s and vice versa, and so some patches may not apply
-cleanly because of that. You might have to resort to merging those hunks
-by hand, if they apply at all to Haiku’s code.
-
-Commit the changes all at once, but list all the commits merged from
-NetBSD in the commit message (see previous merges for the style to
-follow).

docs/develop/net/index.rst

@@ -5,5 +5,4 @@ The Network Stack
    :maxdepth: 2
 
    /net/NetworkStackOverview
-   /net/HowTo-Synchronize_with_NetBSD