[Matrix] Minor fixes with language extension docs

[SaurabhJha]

Summary

There were some issues in the patch https://reviews.llvm.org/D104198. I also forgot to address one comment. This patch addresses these.

[SaurabhJha]

This is a light patch that probably does not require a review and I created a patch anyway.

Would it be appropriate to get this into main using arc land if this is approved? I saw this https://reviews.llvm.org/D78867 which advises against arc land but could not find anything related to that in the main docs.

[xgupta]

In D104971#2842293, @SaurabhJha wrote:

This is a light patch that probably does not require a review and I created a patch anyway.

Would it be appropriate to get this into main using arc land if this is approved? I saw this https://reviews.llvm.org/D78867 which advises against arc land but could not find anything related to that in the main docs.

I follow https://www.llvm.org/docs/Phabricator.html#committing-someone-s-change-from-phabricator
which says git push https://github.com/llvm/llvm-project.git HEAD:main

[xgupta]

btw you should use [Docs] or [NFC] tag for this patch.

[SaurabhJha]

In D104971#2842319, @xgupta wrote:

btw you should use [Docs] or [NFC] tag for this patch.

Okay, will follow the linked docs and amend the commit message with [Docs].

clang/docs/LanguageExtensions.rst

.. code-block:: c++
 
   m4x4_t f(m4x4_t a) {
     return (a + 23) * 12;
   }
 
 The matrix type extension supports division on a matrix and a scalar but not on a matrix and a matrix.
 
 .. code-block:: c++
+
   typedef float m4x4_t __attribute__((matrix_type(4, 4)));
 
   m4x4_t f(m4x4_t a) {
     a = a / 3.0;
     return a;
   }
 
-The matrix type extension supports compound assignments for addition, subtraction, and multiplication between matrices
-and between a matrix and a scalar, provided their types are consistent.
+The matrix type extension supports compound assignments for addition, subtraction, and multiplication on matrices
+and on a matrix and a scalar, provided their types are consistent.
 
 .. code-block:: c++
 
   typedef float m4x4_t __attribute__((matrix_type(4, 4)));
 
   m4x4_t f(m4x4_t a, m4x4_t b) {
     a += b;
     a -= b;