Add missing exception info for HttpClient and SocketsHttpHandler properties

[antonfirsov]

I went through all HttpClient and SocketsHttpHandler properties harmonizing the exception docs with the actual implementation.

I didn't touch HttpClientHandler docs, because most property setters are forwareded to the underlying handler, making it hard to provide comprehensive and reliable docs.

Fixes #10962

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/ncl

[learn-build-service-prod]

Learn Build status updates of commit a92e85b:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details
xml/System.Net.Http/HttpClient.xml	❌Error		Details
xml/System.Net.Http/SocketsHttpHandler.xml	❌Error		Details

• Line 0, Column 0: [Error: ECMA2Yaml_File_LoadFailed] Failed to load 2 files, aborting...

xml/System.Net.Http/HttpClient.xml

• Line 0, Column 0: [Error: ECMA2Yaml_InternalError]

Intenal Several Error: System.Xml.XmlException: The 'Docs' start tag on line 2346 position 8 does not match the end tag of 'exception'. Line 2361, position 11.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
   at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag)
   at System.Xml.XmlTextReaderImpl.ParseEndElement()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
   at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XDocument.Parse(String text, LoadOptions options)
   at ECMA2Yaml.ECMALoader.LoadType(FileItem typeFile)
   at ECMA2Yaml.ECMALoader.LoadTypes(String basePath, Namespace ns)

xml/System.Net.Http/SocketsHttpHandler.xml

• Line 0, Column 0: [Error: ECMA2Yaml_InternalError]

Intenal Several Error: System.Xml.XmlException: The 'Docs' start tag on line 507 position 8 does not match the end tag of 'exception'. Line 523, position 12.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
   at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag)
   at System.Xml.XmlTextReaderImpl.ParseEndElement()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
   at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XDocument.Parse(String text, LoadOptions options)
   at ECMA2Yaml.ECMALoader.LoadType(FileItem typeFile)
   at ECMA2Yaml.ECMALoader.LoadTypes(String basePath, Namespace ns)

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[learn-build-service-prod]

Learn Build status updates of commit 84ad1e1:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Net.Http/HttpClient.xml	✅Succeeded	View
xml/System.Net.Http/SocketsHttpHandler.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[gewarren]

One nit.

[learn-build-service-prod]

Learn Build status updates of commit bf1a7e9:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Net.Http/HttpClient.xml	✅Succeeded	View
xml/System.Net.Http/SocketsHttpHandler.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel