[Documentation:Developer] Added python black formatter option (#561)

Added option to developers to use black formatter to automate formatting
python code

_docs/developer/testing/linting_static_analysis.md

@@ -36,6 +36,18 @@ python3 -m flake8 bin/generate_repos.py
 python3 -m pylint bin/generate_repos.py
 ```
 
+If you wish to automatically fix the basic linting problems, you can use [black formatter](https://github.com/psf/black):
+```bash
+# install black formatter
+pip install git+https://github.com/psf/black
+
+# formats all the files in that directory
+black ./files/location/
+
+# formats specified file
+black ./location/file.py
+```
+
 See also: [Python Style Guide](/developer/coding_style_guide/python)
 
 ## PHP Linting