Update cargo-embed installtion command following merge into probe-rs

Author: n-eq

examples/README.md

@@ -38,7 +38,7 @@ $ rustup target add thumbv7em-none-eabihf
 ```
 Install the tools to flash the device.
 ```console
-$ cargo install cargo-embed
+$ cargo install probe-rs-tools
 ```
 
 ### For Every Project (optional)

examples/blinky-button-demo/README.md

@@ -8,7 +8,7 @@ This hello world example turns on LED 1 when you press Button 1 on the nrf52-dk
 Install `cargo-embed` if you don't have it already:
 
 ```console
-$ cargo install cargo-embed
+$ cargo install probe-rs-tools
 ```
 
 Then just `cd` to the example folder and run

examples/rtc-demo/README.md

@@ -8,7 +8,7 @@ Runs on the nRF52840_DK but can easily be adapted for other hardware.
 Install `cargo-embed` if you don't have it already:
 
 ```console
-$ cargo install cargo-embed
+$ cargo install probe-rs-tools
 ```
 
 Then just `cd` to the example folder and run