Merge pull request #60889 from nextcloud/jtr/cleanup-Request

docs(IRequest): streamline duplicate docs + update for clarity and accuracy

Author: artonge

build/psalm-baseline.xml

@@ -3332,9 +3332,6 @@
     </FalsableReturnStatement>
     <NullableReturnStatement>
       <code><![CDATA[$this->getOverwriteHost()]]></code>
-      <code><![CDATA[isset($this->cookies[$key]) ? $this->cookies[$key] : null]]></code>
-      <code><![CDATA[isset($this->env[$key]) ? $this->env[$key] : null]]></code>
-      <code><![CDATA[isset($this->files[$key]) ? $this->files[$key] : null]]></code>
     </NullableReturnStatement>
     <RedundantCondition>
       <code><![CDATA[\is_array($params)]]></code>