[llvm][doc] fix header for read/write_register intrinsics in LangRef

Mutli-line headers are not allowed in RST, reformat the header to be a
single wide line.

diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 6848410..34cc4bd 100644 (file)
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -12447,9 +12447,8 @@ the escaped allocas are allocated, which would break attempts to use
 .. _int_read_volatile_register:
 .. _int_write_register:
 
-'``llvm.read_register``', '``llvm.read_volatile_register``', and
-'``llvm.write_register``' Intrinsics
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+'``llvm.read_register``', '``llvm.read_volatile_register``', and '``llvm.write_register``' Intrinsics
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Syntax:
 """""""