fix link

Author: russbiggs

src/content/docs/using-the-api/api-key.mdx

@@ -16,7 +16,7 @@ remains available and responsive for all users.
 
 ## Managing Your API Key
 
-Sign up at <a href="https://explore.openaq.org/register" target="_blank" rel="noopener noreferrer" style="display: inline-flex;">https://explore.openaq.org/register <Icon name="external" /></a>to get your API key. You can access and rotate your key from the OpenAQ Explorer
+Sign up at <a href="https://explore.openaq.org/register" target="_blank" rel="noopener noreferrer" style="display: inline-flex;"> explore.openaq.org/register <Icon name="external" /></a>to get your API key. You can access and rotate your key from the OpenAQ Explorer
 account settings page <a href="https://explore.openaq.org/account" target="_blank" rel="noopener noreferrer" style="display: inline-flex;"> explore.openaq.org/account <Icon name="external" /></a>.
 
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