tests: Fix invalid escape warning in BGP-LS test

[cscarpitta]

Pytest reports a DeprecationWarning during collection of tests/topotests/bgp_link_state/test_bgp_link_state.py due to an invalid escape sequence in the module docstring.

test_bgp_link_state.py:6
  /home/user/frr/tests/topotests/bgp_link_state/test_bgp_link_state.py:6: DeprecationWarning: invalid escape sequence '\ '
    """

Fix this by converting the module docstring to a raw string literal (r"""...""").

[greptile-apps]

Greptile Summary

Converts the module docstring in test_bgp_link_state.py from a plain triple-quoted string to a raw string literal (r""") to suppress a Python DeprecationWarning about an invalid escape sequence ('\ ') during pytest collection. The change is minimal and correct.

Confidence Score: 5/5

This PR is safe to merge — it is a trivial one-character docstring fix with no behavioral impact.

Single-line change converting a plain docstring to a raw string literal. No logic, no data, no control flow is affected. The fix correctly addresses the reported DeprecationWarning.

No files require special attention.

Important Files Changed

Filename	Overview
tests/topotests/bgp_link_state/test_bgp_link_state.py	One-character fix: module docstring changed from """ to r""" to eliminate invalid escape sequence DeprecationWarning during pytest collection.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[pytest collects test_bgp_link_state.py] --> B{Docstring type?}
    B -->|Before: plain docstring| C[Python parses escape sequences]
    C --> D[DeprecationWarning: invalid escape backslash-space]
    B -->|After: raw r-docstring| E[Backslashes treated as literals]
    E --> F[Clean collection, no warnings]

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