Fix typos & grammatical errors

Update libraries/ThreadMRI/library.properties
Co-Authored-By: per1234 <accounts@perglass.com>

Update libraries/ThreadMRI/examples/ThreadMRI/ThreadMRI.ino
Co-Authored-By: per1234 <accounts@perglass.com>

Author: 2 people

libraries/ThreadMRI/examples/ThreadMRI/ThreadMRI.ino

@@ -1,5 +1,5 @@
 /* This example demonstrates how to include the MRI library which
-   allows to debug the Portenta H7 Cortex-M7 core with GDB via a
+   allows debugging the Portenta H7 Cortex-M7 core with GDB via a
    serial interface.
 */
 

libraries/ThreadMRI/library.properties

@@ -2,8 +2,8 @@ name=Thread Mode Debug Monitor for Remote Inspection
 version=1.0.0
 author=Adam Green <adamgreen@users.noreply.github.com>
 maintainer=Arduino <info@arduino.cc>
-sentence=Library to enable GDB debugging of Thread Mode code running on the Adruino Portenta H7 over the USB serial connection.
-paragraph=Library to enable GDB debugging of Thread Mode code running on the Adruino Portenta H7 over the USB serial connection.
+sentence=Library to enable GDB debugging of Thread Mode code running on the Arduino Portenta H7 over the USB serial connection.
+paragraph=Library to enable GDB debugging of Thread Mode code running on the Arduino Portenta H7 over the USB serial connection.
 category=Communication
 url=
 architectures=mbed