Fixed typos, improved graphs

Fixed several typos and improved grammar
Made graphs more consistent by adding figure sizes and setting tight layouts
Made smaller adjustments to code to improve legibility (no functionality changed)

Author: rnckp

.gitignore

@@ -352,4 +352,5 @@ MigrationBackup/
 # Ionide (cross platform F# VS Code tools) working folder
 .ionide/
 4-Data-Science-Lifecycle/14-Introduction/README.md
-.vscode/settings.json
+.vscode/settings.json
+*.ipynb