Align "wrong number of arguments" messages

Make "N for M" into the form "given N, expected M".

As I worked, I noticed that the `argnum_error()` function had a part to include the method name in the message.
I think this part is no longer needed by https://github.com/mruby/mruby/pull/5394.

  - Before this patch

    ```console
    % bin/mruby -e '[1, 2, 3].each 0'
    trace (most recent call last):
            [1] -e:1
    -e:1:in each: 'each': wrong number of arguments (1 for 0) (ArgumentError)
    ```

  - After this patch

    ```console
    % bin/mruby -e '[1, 2, 3].each 0'
    trace (most recent call last):
            [1] -e:1
    -e:1:in each: wrong number of arguments (given 1, expected 0) (ArgumentError)
    ```

1 files changed, 1 insertions, 1 deletions

diff --git a/mrbgems/mruby-array-ext/mrblib/array.rb b/mrbgems/mruby-array-ext/mrblib/array.rb
index f7576cbf7..d04c11e64 100644
--- a/mrbgems/mruby-array-ext/mrblib/array.rb
+++ b/mrbgems/mruby-array-ext/mrblib/array.rb
@@ -382,7 +382,7 @@ class Array
 
   def fill(arg0=nil, arg1=nil, arg2=nil, &block)
     if arg0.nil? && arg1.nil? && arg2.nil? && !block
-      raise ArgumentError, "wrong number of arguments (0 for 1..3)"
+      raise ArgumentError, "wrong number of arguments (given 0, expected 1..3)"
     end
 
     beg = len = 0