System.Xml.XDocument Typos

System.Xml.XDocument Typos removed tabs in typo fixes
System.Xml.XmlDocument Typos

System.Xml.XmlDocument removed tabs from typo fixes
System.Xml.XPath Typos

System.Xml.XPath removed tabs in typo fixes

System.Xml.XPath undo wrong typo fix
System.Xml.XPath.XmlDocument Typos
System.Reflection.Metadata Typos
System.Numerics.Vectors Typos

System.Numerics.Vectors removed tabs in typo fixes
System.Collections.Immutable Typos

System.Collections.Immutable removed tabs from typo fixes
Merge pull request #150 from sgtfrankieboy/master

Typo fixes in Comments / Summaries