Add migration guide for PIO2 to PIO3

docs/userguide/lib/cmd_install.rst

@@ -99,6 +99,11 @@ Options
 
 Suppress progress reporting
 
+.. option::
+    --interactive
+
+Allow to make a choice for all prompts
+
 Version control
 ---------------
 

docs/userguide/lib/cmd_search.rst

@@ -89,18 +89,23 @@ Filter libraries by specified author
 
 Filter libraries by specified keyword
 
-
 .. option::
     -f, --framework
 
 Filter libraries by specified framework
 
-
 .. option::
     -p, --platform
 
 Filter libraries by specified keyword
 
+.. option::
+    -i, --header
+
+Filter libraries by header file (include)
+
+For example, ``platformio lib search --header "OneWire.h"``
+
 .. option::
     --json-output