[Documentation:Markdown] Enhanced Markdown Documentation for Additional Features (#573)

Fixes Submitty/Submitty#10072 , where the
Markdown editor in Submitty lacked documentation for certain features,
specifically tables. I have added comprehensive instructions on how to
create tables in Markdown to enhance the documentation.

---------

Co-authored-by: Barb Cutler <[email protected]>

Author: NareshBiradar1

_docs/student/communication/markdown.md

@@ -7,9 +7,12 @@ title: Writing Markdown
 ## Formatting using Markdown
 
 Markdown has become a common standard for formatting online text.
-Submitty allows simple formatting using markdown in several 
-Click on the markdown symbol to enable formatting of your post
-using markdown.
+Submitty allows simple formatting using markdown in
+[Discussion Forum](/student/communication/forum) posts
+(and also on several other Submitty webpages).
+
+To begin, click the markdown symbol to enable formatting of your post using markdown.
+Then use the standard markdown syntax show below:
 
 * **Headings**  
     Adding a number of `#` and a space before text will make it a heading:
@@ -97,4 +100,16 @@ using markdown.
    3. Item 3
    ```
 
+* **Table**
+
+    To add a table, use three or more hyphens `(---)` to create each column’s header, and use pipes `(|)` to separate each column. For compatibility, you should also add a pipe on either end of the row.
+
+    ```
+    | Syntax      | Description |
+    | ----------- | ----------- |
+    | Header      | Title       |
+    | Paragraph   | Text        |
+
+    ```
 
+For more information, see also: [Markdown Guide](https://www.markdownguide.org/)