Update files for Email2Matrix: fix capitalization

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

roles/custom/matrix-email2matrix/tasks/validate_config.yml

@@ -1,12 +1,12 @@
 ---
 
-- name: Fail if no email2matrix mappings
+- name: Fail if no Email2Matrix mappings
   ansible.builtin.fail:
     msg: >
       You need to define at least one mapping in `matrix_email2matrix_matrix_mappings` for enabling Email2Matrix.
   when: "matrix_email2matrix_matrix_mappings | length == 0"
 
-- name: Fail if required email2matrix settings not defined
+- name: Fail if required Email2Matrix settings not defined
   ansible.builtin.fail:
     msg: >-
       You need to define a required configuration setting (`{{ item.name }}`).