first cut at SkRect, SkIRect documentation

All functions should have descriptions, examples, cross-references.
References and spelling have been checked.
More work to do creating and organizing topics.

Docs-Preview: https://skia.org/?cl=56140
Tbr: caryclark@google.com
Bug: skia:6898
Change-Id: I9d1e55d04ab64874c33cac8b91534aa192c2f545
Reviewed-on: https://skia-review.googlesource.com/56140
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
diff --git a/docs/undocumented.bmh b/docs/undocumented.bmh
index d66bcf8..d6a77b9 100644
--- a/docs/undocumented.bmh
+++ b/docs/undocumented.bmh
@@ -168,6 +168,11 @@
 #Topic Data
 ##
 
+#Topic Debugging
+#Method SK_API void SkDebugf(const char format[], ...)
+##
+##
+
 #Topic Device
 #Class SkBaseDevice
 ##
@@ -416,6 +421,12 @@
     ##
     #Method SkScalarCeilToScalar(x)
     ##
+    #Method SkScalarIsFinite(x)
+    ##
+    #Method SkScalarIsNaN(x)
+    ##
+    #Method template <typename D, typename S> inline bool SkTFitsIn(S s)
+    ##
 ##
 
 #Topic Mip_Map
@@ -427,8 +438,14 @@
 #Topic Number_Types
     #Typedef SkGlyphID
     #Typedef ##
+    #Topic Scalar
+    #Alias Scalar
     #Typedef SkScalar
     #Typedef ##
+    ##
+    #Const SK_ScalarMin
+    to be written
+    ##
     #Const SK_ScalarMax
     to be written
     ##
@@ -441,6 +458,12 @@
     #Const SK_ScalarNaN
     to be written
     ##
+    #Const SK_MinS32
+    to be written
+    ##
+    #Const SK_MaxS32
+    to be written
+    ##
     #Typedef SkUnichar
     #Typedef ##
     #Typedef U8CPU