Add .igammac() term entry for PyTorch Tensor Operations (Issue #7793)

[ylevental]

Description

This PR adds a new term entry for the .igammac() method under PyTorch Tensor Operations. The entry includes:

• Description of the method as an alias for torch.special.gammaincc()
• Syntax section with parameter details and return value information
• Example demonstrating basic usage and the complementary relationship with .igamma()
• Codebyte example showing practical application in survival probability calculations

The entry is located at content/pytorch/concepts/tensor-operations/terms/igammac/igammac.md.

Issue Solved

Closes #7793

Type of Change

• Adding a new entry

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[mamtawardhani]

Looks good for a second review! 🚀

[dakshdeepHERE]

LGTM 🚀

[github-actions]

👋 @ylevental
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[ylevental]

@dakshdeepHERE Great! just make sure to change the label "status: under review" to "status: review 2️⃣ completed"