Minor fixes and rewordings

make_bit

     push:
         @if [ "x$(MSG)" = 'x' ] ; then \
-                echo "Usage: MSG='whatever.' make push"; fi
+                echo "Usage: MSG='your message here.' make push"; fi
         @test "x$(MSG)" != 'x'
         git commit -a  -m "$(MSG)"
         git svn fetch

strtod.c

@@ -8,5 +8,5 @@ int main(int argc, char **argv){
     double in = strtod(argv[1], &end);
     Stopif(*end, return 2, "I couldn't parse '%s' to a number. "
                 "I had trouble with '%s'.", argv[1], end);
-    printf("The square of %g is %g\n", argv[1], pow(in, 2));
+    printf("The square of %s is %g\n", argv[1], pow(in, 2));
 }