RFR: 8307480: Improve SA "transported core" documentation for windows

[Chris Plummer]

The SA document `transported_core.html` contains some tips on getting core files to work when debugging it on a machine other than the one that produced it. There are a few improvements that can be made based on information provided in [JDK-8306437](https://bugs.openjdk.org/browse/JDK-8306437) and in the #13836 review (which was eventually pulled as not necessary).

Updates to the document include the use of `sun.jvm.hotspot.debugger.windbg.imagePath` and `sun.jvm.hotspot.debugger.windbg.symbolPath` properties, and adding "`srv*https://msdl.microsoft.com/download/symbols`" to symbolPath.

The rendered html file with these changes can be found here:
https://htmlpreview.github.io/?https://raw.githubusercontent.com/openjdk/jdk/baa6b36cd5b9c5b953fd9f5b8f4461bd4107ee05/src/jdk.hotspot.agent/doc/transported_core.html

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Commit messages:
 - improve windows info

Changes: https://git.openjdk.org/jdk/pull/13849/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13849&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307480
  Stats: 21 lines in 1 file changed: 19 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13849.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13849/head:pull/13849

PR: https://git.openjdk.org/jdk/pull/13849