Suggested refinement of the validation error messages

[zxyanliu]

Is your feature request related to a problem? Please describe.

1. Error message in the Knowledge base name field.

• Spaces are not allowed. This should be mentioned in the error message.

• Letters, numbers, -, and _ are allowed. This should be mentioned in the error message.

  

Suggested change

Spaces and special characters are not allowed. Use letters, numbers, -, or _.

2. Error message in the Knowledge source field.

Suggested change

A valid URL should start with http:// or https://.
A valid URL is required.

3. Watermark message in the Knowledge source field.

Suggested change (if "browse to upload a file" is not supported)

Enter a valid URL

[zxyanliu]

@mareekuh I need your feedback on this so that I can proceed to update.
cc: @hibrenda

[mareekuh]

1. Error message in the Knowledge base name field.
   Watermark text : QnA-Maker_KB_1
   Error text : A knowledge base name cannot contain spaces or special characters. Use letters, numbers, -, or _.

2. Error message in the Knowledge source field.
   Watermark text : Upload a .pdf file or type a URL starting with http:// or https://
   or
   Watermark text : Upload a .pdf file or type a URL
   Error text : A knowledge base URL should start with http:// or https://.