Reviewed By: kiranchandramohan
Differential Revision: https://reviews.llvm.org/D141416
## Generate FIR Documentation
If flang was built with `-DLINK_WITH_FIR=ON` (`ON` by default), it is possible to
generate FIR language documentation by running `ninja flang-doc`. This will
-create `docs/Dialect/FIRLangRef.md` in flang build directory.
+create `<build-dir>/tools/flang/docs/Dialect/FIRLangRef.md` in flang build directory.
## Generate Doxygen-based Documentation
To generate doxygen-style documentation from source code