adjust availability table

Author: linahKhayri

collaboration/communication.md

@@ -31,9 +31,9 @@ how often will we get in touch on each channel, and what we will discuss there:
 
 ### Availability for calling/messaging
 
-| Day    | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday ||
-| ------ | :----: | :-----: | :-------: | :------: | :----: | :------: | :----: ||
-| _name_ |        |         |           |          |        |          |        |
+| Day     | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
+|--------|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| _name_ |     |     |     |     |     |     |     |
 
 ### How many hours everyone has per day