common: cleanup README #285

Job	Run time
Source checkers	46s
Basic build	2m 16s
Ubuntu / Linux (N=1 OS=ubuntu OS_VER=22.04 FAULT_INJECTION=1 TEST_BUILD=debug)	20m 29s
Ubuntu / Linux (N=2 OS=ubuntu OS_VER=22.04 FAULT_INJECTION=1 TEST_BUILD=nondebug UBSAN=1)	23m 32s
Ubuntu / Linux (N=3 OS=ubuntu OS_VER=22.04 PMDK_CC=clang PMDK_CXX=clang++ TEST_BUILD=debug)	20m 15s
Ubuntu / Linux (N=4 OS=ubuntu OS_VER=22.04 PMDK_CC=clang PMDK_CXX=clang++ TEST_BUILD=nondebug AUTO_DOC_UPD...	17m 43s
Ubuntu / Linux (N=5 OS=ubuntu OS_VER=22.04 COVERAGE=1 FAULT_INJECTION=1 TEST_BUILD=debug)	18m 21s
CentOS / CentOS (OS_VER=7 FAULT_INJECTION=1 TEST_BUILD=debug)	18m 15s
CentOS / CentOS (OS_VER=7 TEST_BUILD=nondebug)	17m 36s
CentOS / CentOS (OS_VER=7 TEST_BUILD=debug NDCTL_ENABLE=n)	18m 29s
CentOS / CentOS (OS_VER=7 TEST_BUILD=nondebug NDCTL_ENABLE=n)	13m 53s
CentOS / CentOS (OS_VER=stream TEST_BUILD=debug)	24m 43s
CentOS / CentOS (OS_VER=stream FAULT_INJECTION=1 TEST_BUILD=debug)	25m 14s
CentOS / CentOS (OS_VER=stream TEST_BUILD=nondebug)	17m 0s
	3h 58m 32s

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