Deprecate unofficial Pyboard D guide now docs exist.

README.md

@@ -121,8 +121,9 @@ the constructor.
 
 # Pyboard D
 
-An unofficial guide to this board. When official docs emerge this will be
-removed.
+Note: official docs may now be found [here](https://pybd.io/hw/pybd_sfxw.html).
+This [unofficial guide](./pyboard_d/README.md) now contains little which is not
+in the official docs and will shortly be removed.
 
 # A design for a hardware power meter
 

micropip/README.md

@@ -102,6 +102,10 @@ or
 ```
 python3 -m micropip --help
 ```
+Example invocation line:
+```
+$ micropip.py install -p ~/rats micropython-uasyncio
+```
 
 ###### [Contents](./README.md#1-contents)
 

pyboard_d/README.md

@@ -62,7 +62,7 @@ I am aware of two variants distinguished by the sticker on top of the CPU.
 
 To put the board in booloader mode, either execute pyb.bootloader(), or hold
 down USR during reset and letting go of USR when the LED shines white.
-- you're in bootloader mode when the red LED flashes once a second
+The red LED then flashes once a second indicating bootloader mode.
 - then upload the DFU as usual: tools/pydfu.py -u `firmware`
 
 ## Code emitters