Fix missing .html extension in compilers_index.rst

[skt0725]

Fixes #3886

Description

The compiler tutorials index page contains an incorrect tutorial link that should be fixed.
Line 155 🔗 intermediate/torch_compile_conv_bn_fuser -> 🔗 intermediate/torch_compile_conv_bn_fuser.html

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3887

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

✅ No Failures

As of commit 92eeeaf with merge base 1655d0a ():
💚 Looks good so far! There are no failures yet. 💚

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[sekyondaMeta]

Looks fine, waiting on CI and preview