nixos/doc/gitlab: fix build

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nixos/modules/services/misc/gitlab.xml
··· 80 80 </para> 81 81 82 82 <para>If you're setting up a new Gitlab instance, generate new secrets. You 83 - for instance use <literal>tr -dc A-Za-z0-9 < /dev/urandom | head -c 128</literal> 83 + for instance use <literal>tr -dc A-Za-z0-9 &lt; /dev/urandom | head -c 128</literal> 84 84 to generate a new secret. Gitlab encrypts sensitive data stored in the database. 85 85 If you're restoring an existing Gitlab instance, you must specify the secrets 86 86 secret from <literal>config/secrets.yml</literal> located in your Gitlab state