Use underscores for emphasis style in the Compiler Annotations for C and C++ draft document text

Signed-off-by: Thomas Nyman <[email protected]>

Author: thomasnyman

docs/Compiler-Hardening-Guides/Compiler-Annotations-for-C-and-C++.md

@@ -1,6 +1,6 @@
 # Compiler Annotations for C and C++
 
-> ⓘ NOTE: *This is a draft document by the [Open Source Security Foundation (OpenSSF)](https://openssf.org) [Best Practices Working Group](https://best.openssf.org/). Help to [improve it on Github](https://github.com/ossf/wg-best-practices-os-developers/edit/main/docs/Compiler-Hardening-Guides/Compiler-Annotations-for-C-and-C++.md).*
+> ⓘ NOTE: _This is a draft document by the [Open Source Security Foundation (OpenSSF)](https://openssf.org) [Best Practices Working Group](https://best.openssf.org/). Help to [improve it on Github](https://github.com/ossf/wg-best-practices-os-developers/edit/main/docs/Compiler-Hardening-Guides/Compiler-Annotations-for-C-and-C++.md)._
 
 Compile time security analysis and runtime mitigation implemented in compilers both depend on the compiler being able to see the flow of data between different points in a program, across functions and modules. This is quite a challenge in C and C++ because both languages allow passing around opaque references, thus losing information about objects.  To work around this problem, both GCC and Clang implement attributes to annotate source code, especially functions and data structures, to allow them to do better analysis of source code.  These annotations are not only beneficial for security, but they also help the compilers make better optimization decisions, often resulting in better code.