Update input-requirements.md

Deleting the part about unsupervised training - it is gone in v3 and released as general docs feature

Author: jaep3347

articles/applied-ai-services/form-recognizer/includes/input-requirements.md

@@ -16,6 +16,3 @@ ms.custom: ignite-fall-2021
 * PDF dimensions are up to 17 x 17 inches, corresponding to Legal or A3 paper size, or smaller.
 * The total size of the training data is 500 pages or less.
 * If your PDFs are password-locked, you must remove the lock before submission.
-* For unsupervised learning (without labeled data):
-  * Data must contain keys and values.
-  * Keys must appear above or to the left of the values; they can't appear below or to the right.