Fix grammar

extra/scripts/fix_includes.sh

@@ -26,12 +26,12 @@ usage () {
     echo "for inclusion as the include/linux/ directory provided by"
     echo "uClibc."
     echo ""
-    echo "If the specified kernel headers present and already"
+    echo "If the specified kernel headers are present and already"
     echo "configured for the architecture specified by TARGET_ARCH,"
     echo "they will be used as-is."
     echo ""
-    echo "If the specified kernel headers are entirely missing, this"
-    echo "script returns an error."
+    echo "If the specified kernel headers are missing entirely, this"
+    echo "script will return an error."
     echo ""
     echo "If the specified kernel headers are present, but are either"
     echo "not yet configured or are configured for an architecture"
@@ -42,7 +42,7 @@ usage () {
     echo "are already configured for the selected architecture."
     echo ""
     echo "Most Linux distributions provide 'kernel-headers' packages"
-    echo "that are well suited for use by uClibc."
+    echo "that are suitable for use by uClibc."
     echo ""
     echo ""
     exit 1;