perf c2c: document function view in perf-c2c man page

Describe the function view hierarchy (read-side function -> contending
writer function -> shared cachelines), the per-level indentation, and the
keys, with a worked example.

Document that reliable function attribution requires `iaddr` in
`--coalesce`, that the reader and writer may be the same function, and why
the coalesced function view cannot distinguish same-thread from
different-thread accesses in that case. Also document that verbose mode
includes code addresses in function rows.

Signed-off-by: Jiebin Sun <jiebin.sun@intel.com>
Reviewed-by: Tianyou Li <tianyou.li@intel.com>
Reviewed-by: Wangyang Guo <wangyang.guo@intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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