Formating minor updates

* Switch doc to clang-format 10 (above seems to work fine too)

CONTRIBUTING.md

@@ -102,12 +102,13 @@ But bare in mind, it requires python 3.6+ to run.
 
 ### C++ formatting
 
-Our pre-commit hooks are running [Clang-format](https://releases.llvm.org/6.0.0/tools/clang/docs/ClangFormat.html) to format our c++ codebase. You'll need version 6.0 in order to pass our CI.
+Our pre-commit hooks are running [Clang-format](https://releases.llvm.org/10.0.0/tools/clang/docs/ClangFormat.html) to format our c++ codebase.
+You'll need version 10 (or above) in order to pass our CI.
 ```sh
-sudo apt install clang-format-6.0
+sudo apt install clang-format-10  # available on Ubuntu 20.04
 ```
 
 In case you might want to run Clang-format on the entire codebase, you can do:
 ```sh
-pre-commit run clang-format-6.0 --all
+pre-commit run clang-format --all
 ```