connecting.md: update info about delimiter

Picodata follow-up

• Follow-up for picodata!1363 (merged)
• See also picodata#936 (closed)
• Doc pages to change: https://docs.picodata.io/picodata/devel/tutorial/connecting/

added 1 deleted label

mentioned in merge request picodata!1363 (merged)

assigned to @vardbabayan

created branch vbabayan/394-connecting-md-update-info-about-delimiter to address this issue

mentioned in merge request !581 (merged)

closed with merge request !581 (merged)