change capitalization of e-mail address

Author: nk-coding

docs/docs/handbook/student_management.md

@@ -81,7 +81,7 @@ To import students from a CSV file click on the "<IconInText icon={GenerateIcon}
 
    - _Team_: An identifier of the team the student is put into. If a number is provided, and a team with that number already exists, the student is put into that team. For all other identifiers, new teams are created. If no value is provided, the student is put into no team.
 
-   - _E-Mail Address_: A valid e-mail address of the student.
+   - _E-Mail address_: A valid e-mail address of the student.
 
    - _Ilias-Name_: The Ilias name of the student.
 

docs/docs/handbook/user_management.md

@@ -74,7 +74,7 @@ To import users from a CSV file click on the "<IconInText icon={GenerateIcon} />
 
    - _Lastname (**required**)_: The lastname of the user.
 
-   - _E-Mail Address (**required**)_: A valid e-mail address of the user. Used to send the credentials to if mailing is configured (see [_Provide Credentials_](#provide-credentials) on this page).
+   - _E-Mail address (**required**)_: A valid e-mail address of the user. Used to send the credentials to if mailing is configured (see [_Provide Credentials_](#provide-credentials) on this page).
 
    - _Roles_: All roles of the user. If provided must be a comma-separated list of [_Roles_](./roles) supported by the TMS. If not provided the user only gets assigned the `TUTOR` role.