Fix: short fix of a link in bigint extension doc

[arayikhalatyan]

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[github-actions]

Benchmarks

group	app_log_blowup	app_total_cells_used	app_total_cycles	app_total_proof_time_ms	leaf_log_blowup	leaf_total_cells_used	leaf_total_cycles	leaf_total_proof_time_ms	max_segment_length	instance	alloc
ecrecover_program	2	10,251,804	195,066	(-230.0 [-10.9%]) 1,875.0	-	-	-	-	1048476	64cpu-linux-arm64	mimalloc
fibonacci_program	2	51,615,800	3,000,274	(+90.0 [+1.6%]) 5,571.0	-	-	-	-	1048476	64cpu-linux-arm64	mimalloc
regex_program	2	238,890,449	8,381,808	(+255.0 [+1.5%]) 17,508.0	-	-	-	-	1048476	64cpu-linux-arm64	mimalloc
verify_fibair	2	(+720 [+0.0%]) 48,127,017	(+4 [+0.0%]) 397,138	(-15.0 [-0.5%]) 3,161.0	-	-	-	-	1048476	64cpu-linux-arm64	mimalloc

Commit: 586c8ab

Benchmark Workflow