C#: Address review comments.

Author: michaelnebel

csharp/ql/lib/ext/System.Xml.model.yml

@@ -30,7 +30,7 @@ extensions:
       - ["System.Xml", "XmlDictionaryReader", False, "CreateTextReader", "(System.IO.Stream,System.Xml.XmlDictionaryReaderQuotas)", "", "Argument[0]", "ReturnValue", "taint", "manual"]
       - ["System.Xml", "XmlDictionaryReader", True, "ReadContentAsBase64", "()", "", "Argument[this]", "ReturnValue", "taint", "manual"]
       - ["System.Xml", "XmlDictionaryReader", True, "ReadContentAsBinHex", "()", "", "Argument[this]", "ReturnValue", "taint", "manual"]
-      - ["System.Xml", "XmlDictionaryReader", True, "ReadContentAsBinHex", "(System.Int32)", "", "Argument[this]", "ReturnValue", "taint",  "manual"]
+      - ["System.Xml", "XmlDictionaryReader", True, "ReadContentAsBinHex", "(System.Int32)", "", "Argument[this]", "ReturnValue", "taint", "manual"]
       - ["System.Xml", "XmlDictionaryReader", True, "ReadContentAsChars", "(System.Char[],System.Int32,System.Int32)", "", "Argument[this]", "Argument[0]", "taint", "manual"]
       - ["System.Xml", "XmlDictionaryReader", True, "ReadElementContentAsBase64", "()", "", "Argument[this]", "ReturnValue", "taint", "manual"]
       - ["System.Xml", "XmlDictionaryReader", True, "ReadElementContentAsBinHex", "()", "", "Argument[this]", "ReturnValue", "taint", "manual"]
@@ -113,8 +113,8 @@ extensions:
       - ["System.Xml", "XmlReader", True, "ReadOuterXmlAsync", "()", "", "Argument[this]", "ReturnValue", "taint", "manual"]
       - ["System.Xml", "XmlReader", True, "ReadString", "()", "", "Argument[this]", "ReturnValue", "taint", "df-manual"]
       - ["System.Xml", "XmlReader", True, "ReadSubtree", "()", "", "Argument[this]", "ReturnValue", "taint", "df-manual"]
-      - ["System.Xml", "XmlReader", True, "ReadValueChunk", "()", "", "Argument[this]", "Argument[0]", "taint", "manual"]
-      - ["System.Xml", "XmlReader", True, "ReadValueChunkAsync", "()", "", "Argument[this]", "Argument[0]", "taint", "manual"]
+      - ["System.Xml", "XmlReader", True, "ReadValueChunk", "(System.Char[],System.Int32,System.Int32)", "", "Argument[this]", "Argument[0]", "taint", "manual"]
+      - ["System.Xml", "XmlReader", True, "ReadValueChunkAsync", "(System.Char[],System.Int32,System.Int32)", "", "Argument[this]", "Argument[0]", "taint", "manual"]
       - ["System.Xml", "XmlReader", True, "get_BaseURI", "()", "", "Argument[this]", "ReturnValue", "taint", "df-manual"]
       - ["System.Xml", "XmlReader", True, "get_Item", "(System.Int32)", "", "Argument[this]", "ReturnValue", "taint", "df-manual"]
       - ["System.Xml", "XmlReader", True, "get_Item", "(System.String)", "", "Argument[this]", "ReturnValue", "taint", "df-manual"]

csharp/ql/test/library-tests/dataflow/library/FlowSummaries.expected

@@ -21382,6 +21382,8 @@ summary
 | System.Xml;XmlReader;ReadOuterXmlAsync;();Argument[this];ReturnValue;taint;manual |
 | System.Xml;XmlReader;ReadString;();Argument[this];ReturnValue;taint;df-manual |
 | System.Xml;XmlReader;ReadSubtree;();Argument[this];ReturnValue;taint;df-manual |
+| System.Xml;XmlReader;ReadValueChunk;(System.Char[],System.Int32,System.Int32);Argument[this];Argument[0];taint;manual |
+| System.Xml;XmlReader;ReadValueChunkAsync;(System.Char[],System.Int32,System.Int32);Argument[this];Argument[0];taint;manual |
 | System.Xml;XmlReader;get_BaseURI;();Argument[this];ReturnValue;taint;df-manual |
 | System.Xml;XmlReader;get_Item;(System.Int32);Argument[this];ReturnValue;taint;df-manual |
 | System.Xml;XmlReader;get_Item;(System.String);Argument[this];ReturnValue;taint;df-manual |

csharp/ql/test/library-tests/dataflow/library/FlowSummariesFiltered.expected

@@ -16586,6 +16586,8 @@
 | System.Xml;XmlReader;ReadOuterXmlAsync;();Argument[this];ReturnValue;taint;manual |
 | System.Xml;XmlReader;ReadString;();Argument[this];ReturnValue;taint;df-manual |
 | System.Xml;XmlReader;ReadSubtree;();Argument[this];ReturnValue;taint;df-manual |
+| System.Xml;XmlReader;ReadValueChunk;(System.Char[],System.Int32,System.Int32);Argument[this];Argument[0];taint;manual |
+| System.Xml;XmlReader;ReadValueChunkAsync;(System.Char[],System.Int32,System.Int32);Argument[this];Argument[0];taint;manual |
 | System.Xml;XmlReader;get_BaseURI;();Argument[this];ReturnValue;taint;df-manual |
 | System.Xml;XmlReader;get_Item;(System.Int32);Argument[this];ReturnValue;taint;df-manual |
 | System.Xml;XmlReader;get_Item;(System.String);Argument[this];ReturnValue;taint;df-manual |