Update F411 and RX SPI

docs/development/manufacturer/config-target-guidance.mdx

@@ -17,9 +17,13 @@ Existing designs will not be affected by this change but features maybe restrict
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 :::note
-From the 16th of September 2024 the betaflight project has deprecated implementation of new STM F411 applications.
+From the 16th of September 2024 the betaflight project has deprecated implementation of new STM F411 applications, SPI for RX communications and no longer recommends BMI270:
 
-The BMI270 IMU is no longer recommended due to calibration issues (drift).
+- The STM F411 has been a stable option for those smaller FCs. Whilst the cloud build has extended its useful life (with the limited flash size), the limited available IO renders this chip a poor choice for future designs. We are therefore going to restrict acceptance of new targets with this chipset, in favour of AT32 or G4 options. Existing targets will maintain full support.
+
+- New targets for designs that use SPI for RX communications will not be accepted. This is because we favour the use of serial for RX communications, which is also inline with the wishes of the ELRS development team. Existing targets will maintain support for the time being.
+
+- The BMI270 IMU is no longer recommended due to calibration issues (drift).
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 From the 1st of July 2024 **ALL** targets presented to the config repository for use in the cloud build system will be required to follow these conditions: