docs/idf_monitor: remove the mention of addr2line bug
docs/idf_monitor: remove the mention of addr2line bug

Related to https://github.com/espressif/esp-idf/issues/2149.
Since the new toolchain includes the updated version of binutils,
remove the mention of this bug.

espressif/esp-idf,espressif/esp-idf,espressif/esp-idf,espressif/esp-idf