[PR from 3.x_doc] Update FasterRCNN doc with the right URL of R-50-FPN with BoundedIoULoss

[songyuc]

Motivation

The original the URL of "R-50-FPN BoundedIoULoss" do not point to the corresponding config.

Modification

Modified the URL of R-50-FPN with BoundedIoULoss.

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.

[CLAassistant]

All committers have signed the CLA.

[RangiLyu]

The lint failed, Please run pip install pre-commit and then run pre-commit run --all-files to fix the lint.

[songyuc]

The lint failed, Please run pip install pre-commit and run pre-commit run --all-files to fix the lint.

Now, I just check it by clicking my modified URL, then manually replacing "master" with "3.x" and refreshing the page.
If the config page is shown normally, I can confirm it will be right in the next release from 3.x to the coming master.

[songyuc]

I commit again

[ZwwWayne]

Hi @songyuc ,
Thanks for your kind contribution. Would you like to fix the lint issue so that we could merge this PR?
The details can be found by clicking the item of lint check as shown below

[songyuc]

Hi @songyuc , Thanks for your kind contribution. Would you like to fix the lint issue so that we could merge this PR? The details can be found by clicking the item of lint check as shown below

Hi, @ZwwWayne! Thanks for your patient review. I have fixed the the lint issue.

[OpenMMLab-Assistant005]

Hi @songyuc ！First of all, we want to express our gratitude for your significant PR in the MMDet project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

We would also like to invite you to join our Special Interest Group (SIG) private channel on Discord, where you can share your experiences, ideas, and build connections with like-minded peers. To join the SIG channel, simply message moderator— OpenMMLab on Discord or briefly share your open-source contributions in the #introductions channel and we will assist you. Look forward to seeing you there! Join us ：https://discord.gg/UjgXkPWNqA

If you have WeChat account，welcome to join our community on WeChat. You can add our assistant ：openmmlabwx. Please add "mmsig + Github ID" as a remark when adding friends：）
Thank you again for your contribution❤