perf record: Fix documentation for branch stack sampling
perf record: Fix documentation for branch stack sampling

Signed-off-by: Anshuman Khandual <5cc840ad174e421baefc61e26aff2d5fb1883945@linux.vnet.ibm.com>
Acked-by: Stephane Eranian <f199ae9781930a5b94b284ca2f471140752002a7@google.com>
Cc: Stephane Eranian <f199ae9781930a5b94b284ca2f471140752002a7@google.com>
Link: a294c2d526d51c2547307d74810c3baba0babdd2@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <293abb6b76d7791c0732cc517d38c4b5c734b87f@redhat.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs