Fix compiler warning (#1291)

- In list.h fix a typo in comments.
- In portable/ThirdParty/GCC/Posix/port.c fix compiler warning about
  "gcc -Wwrite-strings".

Signed-off-by: Florian La Roche <Florian.LaRoche@gmail.com>
Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>

Author: laroche

include/list.h

@@ -44,7 +44,7 @@
  *
  * In addition to it's value, each list item contains a pointer to the next
  * item in the list (pxNext), a pointer to the list it is in (pxContainer)
- * and a pointer to back to the object that contains it.  These later two
+ * and a pointer back to the object that contains it.  These later two
  * pointers are included for efficiency of list manipulation.  There is
  * effectively a two way link between the object containing the list item and
  * the list item itself.

portable/ThirdParty/GCC/Posix/port.c

@@ -193,7 +193,7 @@ void prvFatalError( const char * pcCall,
 }
 /*-----------------------------------------------------------*/
 
-static void prvPortSetCurrentThreadName( char * pxThreadName )
+static void prvPortSetCurrentThreadName( const char * pxThreadName )
 {
     #ifdef __APPLE__
         pthread_setname_np( pxThreadName );