Changed the wording to properly describe the shadowing
of the environment from ROM to RAM
Signed-off-by: Bruce Adler <bruce.adler@acm.org>
to be a good choice since it makes it far enough from the
start of the data area as well as from the stack pointer.
-Please note that the environment is read-only as long as the monitor
+Please note that the environment is read-only until the monitor
has been relocated to RAM and a RAM copy of the environment has been
created; also, when using EEPROM you will have to use getenv_r()
until then to read environment variables.