help: Use 'email' instead of 'e-mail' throughout help center.

Replaces the few instances of 'e-mail' with 'email' as that is
more consistently used in the help center documentation.

help/change-organization-url.md

@@ -23,7 +23,7 @@ with the subdomain chosen when the organization was created. Organization
 
 {start_tabs}
 
-Please e-mail [support@zulip.com](mailto:support@zulip.com) with the following
+Please email [support@zulip.com](mailto:support@zulip.com) with the following
 information:
 
 1. Your organization's current subdomain.
@@ -42,7 +42,7 @@ Plus](https://zulip.com/plans/#cloud) licenses.
 
 {start_tabs}
 
-Please e-mail [support@zulip.com](mailto:support@zulip.com) with the following
+Please email [support@zulip.com](mailto:support@zulip.com) with the following
 information:
 
 1. Your organization's current URL.

help/include/import-how-users-will-log-in.md

@@ -17,7 +17,7 @@ Google, GitHub, GitLab, Apple, LDAP and [SAML](/help/saml-authentication).
 You can send password reset emails to all users in your organization, which
 will allow them to set an initial password.
 
-If you imported your organization into Zulip Cloud, simply e-mail
+If you imported your organization into Zulip Cloud, simply email
 [support@zulip.com](mailto:support@zulip.com) to request this.
 
 !!! warn ""

help/include/legacy-log-in.md

@@ -2,12 +2,12 @@
 
 1. Fill out the requested server information, and click **Continue**.
 
-1. Enter the e-mail address of the billing contact for your organization,
+1. Enter the email address of the billing contact for your organization,
    and click **Confirm email**.
 
 **Billing administrator steps:**
 
-1. In your e-mail account, open the e-mail you received
+1. In your email account, open the email you received
    (Subject: Log in to Zulip plan management), and click **Log in**.
 
 1. Verify your information, and click **Continue**. If you are logging in for

help/include/self-hosted-log-in.md

@@ -3,10 +3,10 @@
 
 1. Select <i class="zulip-icon zulip-icon-rocket"></i> **Plan management**.
 
-1. *(first-time log in)* Enter the e-mail address you want to use for plan
+1. *(first-time log in)* Enter the email address you want to use for plan
    management, and click **Continue**.
 
-1. *(first-time log in)* In your e-mail account, open the e-mail you received
+1. *(first-time log in)* In your email account, open the email you received
    (Subject: Confirm email for Zulip plan management), and click **Confirm and
    log in**.
 

help/include/send-us-info.md

@@ -1,2 +1,2 @@
-If you are using Zulip Cloud, we'll take it from here! Please e-mail
+If you are using Zulip Cloud, we'll take it from here! Please email
 [support@zulip.com](mailto:support@zulip.com) with the following information: