Small README edits

Author: jaschmitt

directory-tree-generator-python/source_code_final/README.md

@@ -6,7 +6,7 @@ RP Tree is a command-line tool to generate a directory tree diagram.
 
 To run **RP Tree**, you need to download the source code. Then open a terminal or command-line window and run the following steps:
 
-1. Create and activate a Python virtual environment
+1. Create and activate a Python virtual environment.
 
 ```sh
 $ cd rptree_project/
@@ -15,7 +15,7 @@ $ source venv/bin/activate
 (venv) $
 ```
 
-2. Run the application
+2. Run the application.
 
 ```sh
 (venv) $ python tree.py /path/to/directory/
@@ -51,7 +51,7 @@ If you run RP Tree with a directory path as an argument, then you get the full d
 RP Tree also provides the following options:
 
 - `-v`, `--version` shows the application version and exits
-- `-h`, `--help` show a usage message
+- `-h`, `--help` shows a usage message
 - `-d`, `--dir-only` generates a directory-only tree
 - `-o`, `--output-file` generates a tree and save it to a file in markdown format