Move AVRDUDE example with "-e" flag to Atmel platform page

Author: valeros

platforms/atmelavr_extra.rst

@@ -194,6 +194,24 @@ To upload EEPROM data (from EEMEM directive) you need to use ``uploadeep``
 target instead ``upload`` for :option:`pio run --target` command.
 For example, ``pio run -t uploadeep``.
 
+Erase chip before programming
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In some cases erasing chip memory is a mandatory procedure before uploading bootloader
+or setting fuses. AVRDUDE provides a special flag ``-e`` that causes a chip erase to be
+executed. This will reset the contents of the flash ROM and EEPROM to the value ``0xff``,
+and clear all lock bits. The easiest way to use it is to add this flag via the
+:ref:`projectconf_upload_flags` option:
+
+.. code-block:: ini
+
+    [env:uno]
+    platform = atmelavr
+    framework = arduino
+    board = uno
+    upload_flags =
+      -e
+
 Fuses programming
 ~~~~~~~~~~~~~~~~~
 

projectconf/section_env_upload.rst

@@ -117,22 +117,6 @@ This option can also be set by global environment variable
 
 Please specify each flag/option in a new line starting with minimum 2 spaces.
 
-Here are a few examples for the ``AVRDUDE`` tool used in Atmel-based platforms:
-
-1.  Enable verbose output and erase chip before uploading
-
-.. code-block:: ini
-
-    [env:atmega4809]
-    platform = atmelmegaavr
-    board = atmega4809
-    framework = arduino
-    upload_flags =
-      -V
-      -e
-
-2.  Configure upload settings and set fuses
-
 .. code-block:: ini
 
     [env:atmega328pb]