[BUG] fix docstring style for the API

#### Metadata
* Reference Issue: Fixes #1548 

#### Details 
Our docstrings are written in NumPy docstring style, however in `mkdocs.yml` we used `docstring_style: google` which led to having a wall of text for the parameter sections in the API ref in the documentation.

Author: EmanAbdelhaleem

mkdocs.yml

@@ -127,7 +127,6 @@ plugins:
             docstring_options:
               ignore_init_summary: true
               trim_doctest_flags: true
-              returns_multiple_items: false
             show_docstring_attributes: true
             show_docstring_description: true
             show_root_heading: true
@@ -138,7 +137,7 @@ plugins:
             merge_init_into_class: true
             show_symbol_type_heading: true
             show_symbol_type_toc: true
-            docstring_style: google
+            docstring_style: numpy
             inherited_members: true
             show_if_no_docstring: false
             show_bases: true