Fix necessary word in admin hook view

app/views/admin/hooks/_form.html.haml

@@ -3,7 +3,7 @@
 .form-group
   = form.label :url, _('URL'), class: 'label-bold'
   = form.text_field :url, class: 'form-control gl-form-input'
-  %p.form-text.text-muted= _('URL must be percent-encoded if neccessary.')
+  %p.form-text.text-muted= _('URL must be percent-encoded if necessary.')
 .form-group
   = form.label :token, _('Secret token'), class: 'label-bold'
   = form.text_field :token, class: 'form-control gl-form-input'

locale/gitlab.pot

@@ -38917,7 +38917,7 @@ msgstr ""
 msgid "URL is triggered when repository is updated"
 msgstr ""
 
-msgid "URL must be percent-encoded if neccessary."
+msgid "URL must be percent-encoded if necessary."
 msgstr ""
 
 msgid "URL must start with %{codeStart}http://%{codeEnd}, %{codeStart}https://%{codeEnd}, or %{codeStart}ftp://%{codeEnd}"