[llvm] [Docs][LTO] Updated HowToSubmitABug.rst for LTO crashes (PR #68389)

[Fangrui Song via llvm-commits]

================
@@ -153,6 +153,62 @@ Please run this, then file a bug with the instructions and reduced .bc file
 that bugpoint emits.  If something goes wrong with bugpoint, please submit
 the "foo.bc" file and the option that llc crashes with.
 
+LTO bugs
+---------------------------
+
+If you encounter a bug that leads to crashes in the LLVM LTO phase when using
+the `-flto` option, follow these steps to diagnose and report the issue:
----------------
MaskRay wrote:

double backquotes

https://github.com/llvm/llvm-project/pull/68389