Updated CLI cmd usage comments to shortest alias

Author: adamlui

is-legacy-terminal/docs/README.md

@@ -26,7 +26,7 @@ pip install is-legacy-terminal
 ## 💻 Command line usage
 
 ```bash
-is-legacy-terminal  # or islegacyterm
+is-legacy-terminal  # or islegacy
 # e.g. => True
 ```
 

is-unicode-supported/docs/README.md

@@ -26,7 +26,7 @@ pip install is-unicode-supported
 ## 💻 Command line usage
 
 ```bash
-is-unicode-supported  # or isunicodesupported
+is-unicode-supported  # or supportsunicode
 # e.g. => True
 ```