Minor content fixes found by diff report (#2613)

* Update XmlIgnoreAttribute.xml

* Update BaseDataListDesigner.xml

* Update Regex.xml

Author: TianqiZhang

xml/System.Text.RegularExpressions/Regex.xml

@@ -196,8 +196,8 @@
     <altmember cref="T:System.Configuration.RegexStringValidator" />
     <related type="Article" href="~/docs/standard/base-types/regular-expressions.md">.NET Framework Regular Expressions</related>
     <related type="Article" href="~/docs/standard/base-types/regular-expression-language-quick-reference.md">Regular Expression Language Elements</related>
-    <related type="ExternalDocumentation" href="https://download.microsoft.com/download/D/2/4/D240EBF6-A9BA-4E4F-A63F-AEB6DA0B921C/Regular expressions quick reference.docx">Regular Expressions - Quick Reference (download in Word format)</related>
-    <related type="ExternalDocumentation" href="https://download.microsoft.com/download/D/2/4/D240EBF6-A9BA-4E4F-A63F-AEB6DA0B921C/Regular expressions quick reference.pdf">Regular Expressions - Quick Reference (download in PDF format)</related>
+    <related type="ExternalDocumentation" href="https://download.microsoft.com/download/D/2/4/D240EBF6-A9BA-4E4F-A63F-AEB6DA0B921C/Regular%20expressions%20quick%20reference.docx">Regular Expressions - Quick Reference (download in Word format)</related>
+    <related type="ExternalDocumentation" href="https://download.microsoft.com/download/D/2/4/D240EBF6-A9BA-4E4F-A63F-AEB6DA0B921C/Regular%20expressions%20quick%20reference.pdf">Regular Expressions - Quick Reference (download in PDF format)</related>
   </Docs>
   <Members>
     <MemberGroup MemberName=".ctor">
@@ -5338,4 +5338,4 @@ Allows an <see cref="T:System.Object" /> to attempt to free resources and perfor
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>

xml/System.Web.UI.Design.WebControls/BaseDataListDesigner.xml

@@ -356,7 +356,7 @@ The `DesignTimeHtmlRequiresLoadComplete` property returns `true` if the <xref:Sy
 
 ]]></format>
         </remarks>
-        <altmember cref="T:System.Web.UI.Design.WebControls.BaseDataList" />
+        <altmember cref="T:System.Web.UI.WebControls.BaseDataList" />
         <altmember cref="P:System.Web.UI.Design.WebControls.BaseDataListDesigner.DataSource" />
       </Docs>
     </Member>
@@ -1183,4 +1183,4 @@ The `DesignTimeHtmlRequiresLoadComplete` property returns `true` if the <xref:Sy
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>

xml/System.Xml.Serialization/XmlIgnoreAttribute.xml

@@ -77,7 +77,7 @@
     <related type="Article" href="~/docs/standard/serialization/how-to-specify-an-alternate-element-name-for-an-xml-stream.md">How to: Specify an Alternate Element Name for an XML Stream</related>
     <related type="Article" href="~/docs/standard/serialization/controlling-xml-serialization-using-attributes.md">Controlling XML Serialization Using Attributes</related>
     <related type="Article" href="~/docs/standard/serialization/examples-of-xml-serialization.md">Examples of XML Serialization</related>
-    <related type="Article" href="~/docs/standard/serialization/xml-schema-definition-tool-xsd-exe.md">[XML Schema Definition Tool (Xsd.exe)</related>
+    <related type="Article" href="~/docs/standard/serialization/xml-schema-definition-tool-xsd-exe.md">XML Schema Definition Tool (Xsd.exe)</related>
   </Docs>
   <Members>
     <Member MemberName=".ctor">
@@ -137,4 +137,4 @@
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>