[Mono.Android] Ignore some documentation warnings.

[jpobst]

In #5253 we added support for generating XML documentation for Mono.Android.dll from Java source .jars. However it adds a considerable amount of warnings to the build (40K+).

Add these 2 warning types to <NoWarn>.

C:\a\1\s\src\Mono.Android\obj\Release\monoandroid10\android-30\mcw\Android.Accounts.AccountManager.cs(2029,45): warning CS1658: Identifier expected. See also error CS1001. [C:\a\1\s\src\Mono.Android\Mono.Android.csproj]
C:\a\1\s\src\Mono.Android\obj\Release\monoandroid10\android-30\mcw\Android.Telephony.TelephonyManager.cs(207,21): warning CS1584: XML comment has syntactically incorrect cref attribute '#ACTION_SHOW_VOICEMAIL_NOTIFICATION' [C:\a\1\s\src\Mono.Android\Mono.Android.csproj]

Note XML Documentation is not enabled for PR builds, so the results of this PR are not visible in CI.

[radekdoulik]

Could you please add explanation to the commit message, why these warnings are ignored? I tried to check the generated sources to see the related comments, but the line numbers differ.

The second is probably for

// Metadata.xml XPath field reference: path="/api/package[@name='android.telephony']/class[@name='TelephonyManager']/field[@name='ACTION_SHOW_VOICEMAIL_NOTIFICATION']"
[Register ("ACTION_SHOW_VOICEMAIL_NOTIFICATION", ApiSince = 26)]
public const string ActionShowVoicemailNotification = (string) "android.telephony.action.SHOW_VOICEMAIL_NOTIFICATION";

Not sure though, what is wrong with ACTION_SHOW_VOICEMAIL_NOTIFICATION field name?

[jpobst]

These are not the normal version of the bindings. These have scraped JavaDoc comments put into XML documentation comments in the .cs files. The JavaDocs can contain anything, including full HTML, so this process is not fully converting it all properly.

This process is only done on master builds:

https://devdiv.visualstudio.com/DevDiv/_build/results?buildId=4494114&view=logs&j=8b79172e-ca26-55d2-15fb-eecd370946ec&t=ce67579a-327d-57f8-6725-dd0a5e295d12