WIP Merge touch-up

Signed-off-by: Eric Cousineau <[email protected]>

README.md

@@ -6,16 +6,12 @@ See below sections for what this package currently contains.
 
 ## Clang Thread Safety Annotation Macros
 
-The `rcpputils/thread_safety_annotations.hpp` header provides macros for Clang's [Thread Safety Analysis](https://clang.llvm.org/docs/ThreadSafetyAnalysis.html) feature.
+In [`rcpputils/thread_safety_annotations.hpp`](./include/rcpputils/thread_safety_annotations.hpp), there are macros for Clang's [Thread Safety Analysis](https://clang.llvm.org/docs/ThreadSafetyAnalysis.html) feature.
 
 The macros allow you to annotate your code, but expand to nothing when using a non-clang compiler, so they are safe for cross-platform use.
 
 To use thread safety annotation in your package (in the Clang build only), enable the `-Wthread-safety` compiler flag, and include the header
 
-```
-#include "rcpputils/thread_safety_annotations.h"
-```
-
 For example usage, see [the documentation of this feature](https://clang.llvm.org/docs/ThreadSafetyAnalysis.html) and the tests in `test/test_basic.cpp`
 
 ## Library Discovery