Improve Documentation on Safe MSP Usage in Lua Scripts and best practices

[jurgelenas]

Recent issues in RotorFlight - where frequent MSP polling was used during flight - highlight the need for clearer guidance on best practices for Lua script development, particularly regarding telemetry usage.

To help prevent similar problems in the future, I suggest we expand the documentation on the following pages to include recommendations for safe and appropriate use of crossfireTelemetryPush() and crossfireTelemetryPop() in Lua scripts:

• https://luadoc.edgetx.org/lua-api-reference/rf-module/crossfiretelemetrypush
• https://luadoc.edgetx.org/lua-api-reference/rf-module/crossfiretelemetrypop

These updates should explain the potential impact of inflight MSP usage on RC link performance and latency, and encourage developers to avoid or greatly limit MSP activity while the model is armed or in flight.