docs: sanitize real domain names out of OIDC diagram

The zone-band labels spelled out *.local.thesabear.net and
*.caddy.thesabear.net literally - the same internal zone naming
pattern already sanitized out of this doc's prose, missed on the
diagram itself. Replaced with generic zone names, no domain.

assets/sso-and-identity-oidc-cross-zone-redirect.svg

@@ -1,4 +1,4 @@
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edge=&quot;1&quot; parent=&quot;1&quot; style=&quot;endArrow=none;dashed=1;html=1;strokeColor=#999999;&quot;&gt;&#10;          &lt;mxGeometry relative=&quot;1&quot; as=&quot;geometry&quot;&gt;&#10;            &lt;mxPoint x=&quot;810&quot; y=&quot;130&quot; as=&quot;sourcePoint&quot; /&gt;&#10;            &lt;mxPoint x=&quot;810&quot; y=&quot;560&quot; as=&quot;targetPoint&quot; /&gt;&#10;          &lt;/mxGeometry&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;s1&quot; edge=&quot;1&quot; parent=&quot;1&quot; style=&quot;html=1;labelBackgroundColor=#1C1D1E;endArrow=block;strokeColor=#666666;fontColor=#666666;strokeWidth=2;fontSize=12;&quot; value=&quot;&amp;lt;span style=&amp;quot;background-color: light-dark(rgb(255, 255, 255), Line truncated
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User opens appLine truncated