Fix formatting and add method signature for CA5372 rule (#48940)

Author: kurnakovv

docs/fundamentals/code-analysis/quality-rules/ca5372.md

@@ -65,7 +65,10 @@ The type of the first parameter of `XPathDocument` is not `XmlReader`.
 using System.IO;
 using System.Xml.XPath;
 ...
-var obj = new XPathDocument(stream);
+public void TestMethod(Stream stream)
+{
+    var obj = new XPathDocument(stream);
+}
 ```
 
 ### Solution
@@ -76,6 +79,6 @@ using System.Xml.XPath;
 ...
 public void TestMethod(XmlReader reader)
 {
-var obj = new XPathDocument(reader);
+    var obj = new XPathDocument(reader);
 }
 ```