docs: deprecate kernel-doc-nano-HOWTO.txt

Now that the new Sphinx world order is taking over, the information in
kernel-doc-nano-HOWTO.txt is outmoded.  I hate to remove it altogether,
since it's one of those files that people expect to find.  But we can add a
warning and fix all the other pointers to it.
Reminded-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/00-INDEX

@@ -255,10 +255,10 @@ kbuild/
 	- directory with info about the kernel build process.
 kdump/
 	- directory with mini HowTo on getting the crash dump code to work.
-kernel-doc-nano-HOWTO.txt
-	- mini HowTo on generation and location of kernel documentation files.
 kernel-docs.txt
 	- listing of various WWW + books that document kernel internals.
+kernel-documentation.rst
+	- how to write and format reStructuredText kernel documentation
 kernel-parameters.txt
 	- summary listing of command line / boot prompt args for the kernel.
 kernel-per-CPU-kthreads.txt

Documentation/CodingStyle

@@ -458,7 +458,7 @@ of the function, telling people what it does, and possibly WHY it does
 it.
 
 When commenting the kernel API functions, please use the kernel-doc format.
-See the files Documentation/kernel-doc-nano-HOWTO.txt and scripts/kernel-doc
+See the files Documentation/kernel-documentation.rst and scripts/kernel-doc
 for details.
 
 Linux style for comments is the C89 "/* ... */" style.

Documentation/development-process/4.Coding

@@ -346,7 +346,7 @@ which have not been so documented, there is no harm in adding kerneldoc
 comments for the future; indeed, this can be a useful activity for
 beginning kernel developers.  The format of these comments, along with some
 information on how to create kerneldoc templates can be found in the file
-Documentation/kernel-doc-nano-HOWTO.txt.
+Documentation/kernel-documentation.rst.
 
 Anybody who reads through a significant amount of existing kernel code will
 note that, often, comments are most notable by their absence.  Once again,

Documentation/kernel-doc-nano-HOWTO.txt

+NOTE: this document is outdated and will eventually be removed.  See
+Documentation/kernel-documentation.rst for current information.
+
 kernel-doc nano-HOWTO
 =====================
 

Documentation/zh_CN/CodingStyle

@@ -399,7 +399,7 @@ C是一个简朴的语言，你的命名也应该这样。和 Modula-2 和 Pasca
 些事情的原因。
 
 当注释内核API函数时，请使用 kernel-doc 格式。请看
-Documentation/kernel-doc-nano-HOWTO.txt和scripts/kernel-doc 以获得详细信息。
+Documentation/kernel-documentation.rst和scripts/kernel-doc 以获得详细信息。
 
 Linux的注释风格是 C89 “/* ... */” 风格。不要使用 C99 风格 “// ...” 注释。