Update README.md with detailed embedding instructions

Made instructions for embeddings easier to understand and completely omitted file extension usage since .pt extension is not used here and it not being needed either way.

README.md

@@ -78,4 +78,9 @@ Doc: https://docs.comfy.org/tutorials/video/minimax/minimax-h3
 
 ## Embeddings
 
-To use the embeddings in a text prompt, invoke them in the CLIPTextEncode node like this (you can omit the .pt extension): `embedding:embedding_filename.pt`.
+To use the embeddings in a text prompt, invoke them in the CLIPTextEncode node by
+combining `embedding:` with the filename of the embedding like this for `minimaxh3_art_is_explosion`:
+```
+embedding:minimaxh3_art_is_explosion
+```
+Just exchange the `minimaxh3_art_is_explosion` part with the filename of the embedding you want to use.