all: Fix "reuse" and "overridden" spelling mistakes.

Codespell doesn't pick up "re-used" or "re-uses", and ignores the tests/
directory, so fix these manually.

Signed-off-by: Damien George <damien@micropython.org>

docs/library/bluetooth.rst

@@ -312,7 +312,7 @@ Broadcaster Role (Advertiser)
     in all broadcasts, and *resp_data* is send in reply to an active scan.
 
     **Note:** if *adv_data* (or *resp_data*) is ``None``, then the data passed
-    to the previous call to ``gap_advertise`` will be re-used. This allows a
+    to the previous call to ``gap_advertise`` will be reused. This allows a
     broadcaster to resume advertising with just ``gap_advertise(interval_us)``.
     To clear the advertising payload pass an empty ``bytes``, i.e. ``b''``.
 

docs/library/rp2.StateMachine.rst

@@ -32,7 +32,7 @@ Methods
 
     The program is added to the instruction memory of this PIO instance. If the
     instruction memory already contains this program, then its offset is
-    re-used so as to save on instruction memory.
+    reused so as to save on instruction memory.
 
     - *freq* is the frequency in Hz to run the state machine at. Defaults to
       the system clock frequency.

docs/reference/constrained.rst

@@ -211,7 +211,7 @@ two loops:
         spi.readinto(buf)
         # process data in buf
 
-The first creates a buffer on each pass whereas the second re-uses a pre-allocated
+The first creates a buffer on each pass whereas the second reuses a pre-allocated
 buffer; this is both faster and more efficient in terms of memory fragmentation.
 
 **Bytes are smaller than ints**