Invalid Javadoc links to https://javaee.github.io/jakartamail/...

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**Describe the bug**
API documentation links to external material lead to 404 HTTP errors.

**To Reproduce**
Steps to reproduce the behavior:
1. Read link from https://github.com/eclipse-ee4j/mail/blob/fedabffb18abf8f4730f75d92e28980e20d0ad82/api/src/main/java/jakarta/mail/package-info.java#L28
2. https://javaee.github.io/jakartamail/docs/JakartaMail-1.6.pdf does not exist (and the filename does not match the API version neither btw)
3. Read links from https://github.com/eclipse-ee4j/mail/blob/fedabffb18abf8f4730f75d92e28980e20d0ad82/api/src/main/java/jakarta/mail/package-info.java#L58-L61
4. https://javaee.github.io/jakartamail/FAQ.html & https://javaee.github.io/jakartamail/ lead to 404s

**Expected behavior**
The Javadoc content to refer to existing material.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- OS: [e.g. iOS]
- Browser [e.g. chrome, safari]
- Version [e.g. 22]

**Smartphone (please complete the following information):**
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version [e.g. 22]

**Mail server:**
- Protocol being used: [e.g. smtp, imap, pop3, etc.]
- Vendor/product: [e.g. Microsoft Exchange]
- Mail service URL: [e.g. gmail.com]

**Additional context**
Add any other context about the problem here.

Start in api/src/main/java/jakarta/mail/package-info.java at the links cited around lines 28 and 58-61. Check the current Jakarta Mail documentation locations and verify the referenced pages are reachable and appropriate for the API version. Done means the Javadoc links no longer lead to 404 errors.

Written by the indexing model from the issue text.