fix(book): add missing `path.md` entry to SUMMARY

[github-actions[bot]]

Bencher

Report	Fri, September 13, 2024 at 08:33:20 UTC
Project	laze
Branch	521/merge
Testbed	github-actions

🚨 1 ALERT: Threshold Boundary Limit exceeded!

Benchmark	Measure (units)	View	Value	Lower Boundary	Upper Boundary
laze -C RIOT build --global --generate-only	perf:task-clock (msec)	🚨 (view plot | view alert)	9,780.81 (+5.32%)	9,019.56 (92.22%)	9,553.90 (102.38%)

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Benchmark	perf:task-clock	perf:task-clock Results msec | (Δ%)	perf:task-clock Lower Boundary msec | (%)	perf:task-clock Upper Boundary msec | (%)
laze -C RIOT build --global --generate-only	🚨 (view plot | view alert)	9,780.81 (+5.32%)	9,019.56 (92.22%)	9,553.90 (102.38%)

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[coveralls]

coverage: 85.192%. remained the same when pulling 1fe0553ed068985344da9849d6258d5213937cf8 on fix-path-book-summary-entry into 6e2f17122ccd873646f1887e36d11aee6bad9dc1 on main.