remove extra space in assignment to align with style guide

foundations/html_css/css-foundations/intro-to-css.md

@@ -366,7 +366,7 @@ If you need to add a _unique_ style for a _single_ element, this method can work
 
 <div class="lesson-content__panel" markdown="1">
 
-1.  Go to our [CSS exercises repository](https://github.com/TheOdinProject/css-exercises) and read the README. Then, once you know how to use the exercises, navigate to the `foundations` directory. Review each README file prior to completing the following exercises in order:
+1. Go to our [CSS exercises repository](https://github.com/TheOdinProject/css-exercises) and read the README. Then, once you know how to use the exercises, navigate to the `foundations` directory. Review each README file prior to completing the following exercises in order:
     - `01-css-methods`
     - `02-class-id-selectors`
     - `03-group-selectors`