routerrpc: fix comment in lsp heuristic

[ziggie1984]

Fix the comment in the lsp heuristic code.

[gemini-code-assist]

Summary of Changes

Hello @ziggie1984, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a minor documentation inaccuracy within the routerrpc package. It updates comments related to LSP (Lightning Service Provider) heuristic and route grouping to correctly state that the system selects the route with the highest fee, rather than the cheapest, when probing LSPs. This ensures the code's documentation aligns with its actual behavior.

Highlights

• Comment Correction: Updated comments in router_server.go to accurately reflect that LSP probing aims to find "the route with the highest fee" instead of "the cheapest route".

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[gemini-code-assist]

Code Review

This pull request correctly updates comments in lnrpc/routerrpc/router_server.go to reflect that the LSP probing heuristic aims to find the route with the highest fee for worst-case estimation, not the cheapest one. The changes are accurate and improve code clarity. The modifications align with the existing logic, which seeks the most expensive route among LSP candidates. Good catch and fix!