docs: fix misspelling across the tree

Found a few annoying typos and figured I better run script and
fix anything it can find, here are the results...

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

scripts/coccicheck

diff --git a/scripts/coccicheck b/scripts/coccicheck
index c95c9de..5d0a96f 100755
--- a/scripts/coccicheck
+++ b/scripts/coccicheck
@@ -146,7 +146,7 @@
 
     if [[ $VIRTUAL = "" ]]; then
 	    echo "No available modes found in \"$COCCI\" script."
-	    echo "Consider adding vitrual rules to the script."
+	    echo "Consider adding virtual rules to the script."
 	    exit 1
     elif [[ $VIRTUAL != *"$MODE"* ]]; then
 	    echo "Invalid mode \"$MODE\" supplied!"
@@ -161,7 +161,7 @@
 	    else
 		    MODE=org
 	    fi
-	    echo "Using random availble mode: \"$MODE\""
+	    echo "Using random available mode: \"$MODE\""
 	    echo ''
     fi