docs/branching.md: Standardize hyphenation of "cherry-picking" across TOC and headings

[coderabbitai]

Summary

In docs/branching.md, the term "cherry-picking" is hyphenated inconsistently:

• Line 15 (TOC): "Cherry-picking" ✅ (hyphenated — correct)
• Line 20 (TOC): "Cherry picking" ❌ (non-hyphenated)
• Line 250 (section heading): "Cherry picking" ❌ (non-hyphenated)

All occurrences should use the hyphenated form "Cherry-picking" for grammatical correctness and visual consistency.

Suggested fix

-    * [Cherry picking](#cherry-picking)
+    * [Cherry-picking](#cherry-picking)

-### Cherry picking
+### Cherry-picking

References

• PR: LCORE-1645: Contribution and branching documentation #1937
• Review comment: LCORE-1645: Contribution and branching documentation #1937 (comment)

/cc @tisnik