updating the comments for reasoning of using css attribute instead of…

… a css property

component/src/views/chat/input/textInput/textInput.css

@@ -70,6 +70,7 @@
 }
 
 [contenteditable]:empty:before {
+  /* Has to be an attribute to be accessed by contenteditable pseusod element and pseudo classes */
   content: attr(deep-chat-placeholder-text);
   pointer-events: none;
 }