documentation: SkDocument::MakePDF()

also, update some tools.

DOCS_PREVIEW= https://skia.org/user/sample/pdf?cl=1936283003
DOCS_PREVIEW= https://skia.org/user/api/canvas?cl=1936283003

Review-Url: https://codereview.chromium.org/1936283003
diff --git a/tools/fiddle/fiddle_main.cpp b/tools/fiddle/fiddle_main.cpp
index 3e15708..bf7a032 100644
--- a/tools/fiddle/fiddle_main.cpp
+++ b/tools/fiddle/fiddle_main.cpp
@@ -137,7 +137,7 @@
     }
     if (options.pdf) {
         SkDynamicMemoryWStream pdfStream;
-        sk_sp<SkDocument> document(SkDocument::CreatePDF(&pdfStream));
+        sk_sp<SkDocument> document(SkDocument::MakePDF(&pdfStream));
         draw(document->beginPage(options.size.width(), options.size.height()));
         document->close();
         pdfData.reset(pdfStream.copyToData());