Update submission.md

[hamid1103]

Fixed the link to the onlinetext directory

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[Copilot]

Pull request overview

This PR updates a GitHub link in the version 5.1 documentation to point to the onlinetext submission plugin by adding /public to the repository path.

Key Changes

• Modified the GitHub URL path from .../main/mod/assign/... to .../main/public/mod/assign/...

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[Copilot]

The link path now includes /public, but the similar link in the companion feedback.md file (line 22 of versioned_docs/version-5.1/apis/plugintypes/assign/feedback.md) still uses the old path without /public. For consistency, both files should use the same path structure. Please verify which path is correct and update both files accordingly.

Suggested change

	For a good reference implementation, see the [onlinetext](https://github.com/moodle/moodle/tree/main/public/mod/assign/submission/onlinetext) submission plugin included with core because it uses most of the features of submission plugins.
	For a good reference implementation, see the [onlinetext](https://github.com/moodle/moodle/tree/main/mod/assign/submission/onlinetext) submission plugin included with core because it uses most of the features of submission plugins.