docs: ioctl-number.txt: convert it to ReST format

The conversion itself is simple: add a markup for the
title of this file and add markups for both tables.

Yet, the big table here with IOCTL numbers is badly formatted:
on several lines, the "Include File" column has some values that
are bigger than the reserved space there.

Also, on several places, a comment was misplaced at the "Include
File" space.

So, most of the work here is to actually ensure that each field
will be properly fixed.

Also worth to mention that some URLs have the asterisk character
on it. Well, Sphinx has an issue with asterisks in the middle
of an string. As this is URL, use the alternate format: %2A.

As a side effect of this patch, it is now a lot easier to see that
some reserved ioctl numbers are missing the include files
where it is supposed to be used.

PS.: While this is part of a subdir, I opted to convert this
single file alone, as this file has a potential of conflicts,
as most subsystem maintainers touch it.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/process/submit-checklist.rst

@@ -107,7 +107,7 @@ and elsewhere regarding submitting Linux kernel patches.
     and why.
 
 26) If any ioctl's are added by the patch, then also update
-    ``Documentation/ioctl/ioctl-number.txt``.
+    ``Documentation/ioctl/ioctl-number.rst``.
 
 27) If your modified source code depends on or uses any of the kernel
     APIs or features that are related to the following ``Kconfig`` symbols,

Documentation/translations/it_IT/process/submit-checklist.rst

@@ -117,7 +117,7 @@ sottomissione delle patch, in particolare
     sorgenti che ne spieghi la logica: cosa fanno e perché.
 
 25) Se la patch aggiunge nuove chiamate ioctl, allora aggiornate
-    ``Documentation/ioctl/ioctl-number.txt``.
+    ``Documentation/ioctl/ioctl-number.rst``.
 
 26) Se il codice che avete modificato dipende o usa una qualsiasi interfaccia o
     funzionalità del kernel che è associata a uno dei seguenti simboli

Documentation/translations/zh_CN/process/submit-checklist.rst

@@ -97,7 +97,7 @@ Linux内核补丁提交清单
 24) 所有内存屏障例如 ``barrier()``, ``rmb()``, ``wmb()`` 都需要源代码中的注
     释来解释它们正在执行的操作及其原因的逻辑。
 
-25) 如果补丁添加了任何ioctl，那么也要更新 ``Documentation/ioctl/ioctl-number.txt``
+25) 如果补丁添加了任何ioctl，那么也要更新 ``Documentation/ioctl/ioctl-number.rst``
 
 26) 如果修改后的源代码依赖或使用与以下 ``Kconfig`` 符号相关的任何内核API或
     功能，则在禁用相关 ``Kconfig`` 符号和/或 ``=m`` （如果该选项可用）的情况

include/uapi/rdma/rdma_user_ioctl_cmds.h

@@ -36,7 +36,7 @@
 #include <linux/types.h>
 #include <linux/ioctl.h>
 
-/* Documentation/ioctl/ioctl-number.txt */
+/* Documentation/ioctl/ioctl-number.rst */
 #define RDMA_IOCTL_MAGIC	0x1b
 #define RDMA_VERBS_IOCTL \
 	_IOWR(RDMA_IOCTL_MAGIC, 1, struct ib_uverbs_ioctl_hdr)