doc: fix TCPRcvCollapsed comment #2377

Job	Run time
test-integration (1.22, ubuntu-22.04, build/config/plain.sh)	3m 3s
test (1.22, ubuntu-22.04, build/config/plain.sh)	2m 33s
test-integration (1.22, ubuntu-22.04, build/config/libpfm4.sh)	3m 8s
test (1.22, ubuntu-22.04, build/config/libpfm4.sh)	2m 41s
test (1.22, ubuntu-22.04, build/config/libipmctl.sh)	2m 44s
test-integration (1.22, ubuntu-22.04, build/config/libipmctl.sh)	3m 16s
test (1.21, ubuntu-22.04, build/config/plain.sh)	2m 34s
test-integration (1.21, ubuntu-22.04, build/config/plain.sh)	2m 59s
test-integration (1.21, ubuntu-22.04, build/config/libpfm4.sh)	2m 55s
test-integration (1.21, ubuntu-22.04, build/config/libipmctl.sh)	3m 14s
test (1.21, ubuntu-22.04, build/config/libpfm4.sh)	2m 37s
test (1.21, ubuntu-22.04, build/config/libipmctl.sh)	2m 50s
	34m 34s

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