build: fix warnings for api docs generation not printed

Fixes that warnings for the API docs generation are not printed. We used
an incorrect name for the log level. Additionally this commit fixes one
remaining warning for danging API doc links.

(cherry picked from commit 1f5648f)

Author: devversion

tools/dgeni/docs-package.ts

@@ -63,7 +63,7 @@ apiDocsPackage.processor(new AsyncFunctionsProcessor());
 
 // Configure the log level of the API docs dgeni package.
 apiDocsPackage.config(function (log: any) {
-  return (log.level = 'warning');
+  return (log.level = 'warn');
 });
 
 // Configure the processor for reading files from the file system.
@@ -105,7 +105,7 @@ apiDocsPackage.config(function (parseTagsProcessor: any) {
 
 apiDocsPackage.config(function (checkAnchorLinksProcessor: any) {
   // This ensures that Dgeni will fail if we generate links that don't follow this format.
-  checkAnchorLinksProcessor.ignoredLinks.push(/(components|cdk)\/[\w-]+\/api#\w+/);
+  checkAnchorLinksProcessor.ignoredLinks.push(/(components|cdk)\/[\w-]+(\/testing)?\/api#\w+/);
 });
 
 // Configure the processor for understanding TypeScript.

tools/dgeni/patch-log-service.ts

@@ -21,6 +21,6 @@ export function patchLogService(log: any) {
       return;
     }
 
-    _warnFn.apply(this, [message]);
+    _warnFn.apply(log, [message]);
   };
 }