Fix incorrect documentation URL references

[leeyi45]

Quick and dirty PR for fixing the developer documentation . @RichDom2185 if there is nothing else I'd like to merge this ahead of other fixes, otherwise the documentation for the repository is not accessible

[sentry]

Bug: The markdown link in README.md at line 20 is missing a closing > character, malforming the URL.
_{Severity: HIGH | Confidence: 1.00}

🔍 Detailed Analysis

The markdown table entry for 'Developer Documentation' in README.md at line 20 is missing the closing angle bracket > for the URL. This malforms the link https://source-academy.github.io/modules/devdocs causing markdown parsers to not recognize it as a valid clickable link. This results in incorrect rendering of the table cell and prevents the link from being clickable.

💡 Suggested Fix

Add the closing angle bracket > to the URL in the markdown table entry for 'Developer Documentation' in README.md at line 20. The corrected line should be | Developer Documentation | <https://source-academy.github.io/modules/devdocs> |.

🤖 Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: README.md#L20

Potential issue: The markdown table entry for 'Developer Documentation' in `README.md`
at line 20 is missing the closing angle bracket `>` for the URL. This malforms the link
`https://source-academy.github.io/modules/devdocs` causing markdown parsers to not
recognize it as a valid clickable link. This results in incorrect rendering of the table
cell and prevents the link from being clickable.

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[RichDom2185]

Okay for me, but CI is failing?