The guided field service walkthrough now fills in the worksheet before asking the customer to validate and sign the task report. This prevents the tour from stopping midway and helps users complete the process smoothly.

Prior to this commit, the tour was blocking at step `Invite your customer to
<b>validate and sign your task report</b>.` as the worksheet was not complete.

This commit adds a step in order to ensure that something is written in the
worksheet to ensure it gets completed.

A broken image/link reference in the Documents spreadsheet placeholder was corrected after a recent code split. This ensures users see the intended placeholder graphic instead of a missing or incorrect visual.