Use standard PNGs in reference manual

This commit converts interlaced PNGs to standard PNGs and uses PNGs
instead of GIFs consistently within the reference manual in order to
avoid issues with AsciiDoc’s support for inlined images.

Issue: SPR-14997

Author: sbrannen

src/docs/asciidoc/data-access.adoc

@@ -2088,7 +2088,7 @@ The exception hierarchy that Spring provides can be seen below. (Please note tha
 class hierarchy detailed in the image shows only a subset of the entire
 `DataAccessException` hierarchy.)
 
-image::images/DataAccessException.gif[]
+image::images/DataAccessException.png[]