611 515 fix links

[mathpluscode]

Description

Fix dead links

Fixes #611, #515

Type of change

What types of changes does your code introduce to DeepReg?

Please check the boxes that apply after submitting the pull request.

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Documentation Update (fix or improvement on the documentation)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Other (if none of the other choices apply)

Checklist

Please check the boxes that apply after submitting the pull request.

If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I have installed pre-commit using pre-commit install and formatted all changed files. If you are not certain, run pre-commit run --all-files.
• [x] My commits' message styles matches our requested structure, e.g. Issue #<issue number>: detailed message.
• [x] I have updated the change log file regarding my changes.
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)

[mathpluscode]

Two simple fixes @YipengHu @kate-sann5100

[scrutinizer-notifier]

The inspection completed: No new issues

[codecov[bot]]

Codecov Report

Merging #638 (a2c4270) into main (510d39b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #638   +/-   ##
=======================================
  Coverage   99.67%   99.67%           
=======================================
  Files          33       33           
  Lines        2175     2175           
=======================================
  Hits         2168     2168           
  Misses          7        7           

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