updated the docs of the grid options and the stellar types

binarycpython/utils/grid_options_defaults.py

 """
-Module that contains the default options for the population grid code, 
+Module that contains the default options for the population grid code along with the description for these options, in the form of dictionaries: 
+    - grid_options_defaults_dict: dictionary containing the default values for all the options
+    - grid_options_descriptions: dictionary containing the description for these options.
 
-along with a dictionary containing descriptions for each of the parameters, and some utility functions:
-- grid_options_help: interactive function for the user to get descriptions for options 
-- grid_options_description_checker: function that checks that checks which options have a description.
+There are several other functions in this module, mostly to generate help texts or documents:
+    - grid_options_help: interactive function for the user to get descriptions for options 
+    - grid_options_description_checker: function that checks that checks which options have a description.
+    - write_grid_options_to_rst_file: function to generate the .rst document for the docs
 
 With this its also possible to automatically generate a pdf file containing all the setting names + descriptions. 
 
@@ -472,9 +475,13 @@ grid_options_descriptions = {
 # Grid options functions
 
 # Utility functions
-def grid_options_help(option):
+def grid_options_help(option: str) -> str:
     """
-    Function that returns the description of a grid option
+    Function that prints out the description of a grid option. Useful function for the user.
+
+    Args:
+        option: which option you want to have the description of
+
     """
 
     option_keys = grid_options_defaults_dict.keys()
@@ -489,14 +496,22 @@ def grid_options_help(option):
         else:
             print(grid_options_descriptions[option])
 
-def grid_options_description_checker(print_info=True):
+def grid_options_description_checker(print_info: bool=True) -> int:
     """
-    Function that checks which descriptions are missing
+    Function that checks which descriptions are missing 
+    
+    Args:
+        print_info: whether to print out information about which options contain proper descriptions and which do not
+
+    Returns:
+        the amount of undescribed keys
     """
 
+    # Get the keys
     option_keys = grid_options_defaults_dict.keys()
     description_keys = grid_options_descriptions.keys()
 
+    # 
     undescribed_keys = list(set(option_keys)-set(description_keys))
 
     if undescribed_keys:
@@ -505,11 +520,15 @@ def grid_options_description_checker(print_info=True):
             print("Total description progress: {:.2f}%%".format(100 * len(description_keys)/len(option_keys)))
     return len(undescribed_keys)
 
-def write_grid_options_to_rst_file(output_file):
+def write_grid_options_to_rst_file(output_file: str) -> None:
     """
     Function that writes the descriptions of the grid options to a rst file
     
-    TODO: seperate things into private and public options
+    Tasks:
+        TODO: seperate things into private and public options
+
+    Args:
+        output_file: target file where the grid options descriptions are written to
     """
 
     # Get the options and the description

binarycpython/utils/stellar_types.py

 """
-Module containing stellar type dicts
+Module containing two stellar type dicts:
+    - STELLAR_TYPE_DICT: dictionary with long names
+    - STELLAR_TYPE_DICT_SHORT: dictionary with short names/abbreviations
 """
 
 STELLAR_TYPE_DICT = {