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.

docs/en/api-guides/tools/idf-monitor.rst

@@ -93,8 +93,6 @@ To decode each address, IDF Monitor runs the following command in the background
 
   xtensa-esp32-elf-addr2line -pfiaC -e build/PROJECT.elf ADDRESS
 
-.. note:: Due to a bug in addr2line, line numbers may be incorrect for some source files. However, the function name is always correct.
-
 
 Launching GDB with GDBStub
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