RFR: 8263546: Add "findsym" command to clhsdb.html help file

[Yasumasa Suenaga]

On Sat, 13 Mar 2021 00:28:48 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Added clhsdb help for findsym, which was missed when the findsym command was recently added. Also fixed a very minor typo in the findpc help.

Marked as reviewed by ysuenaga (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2983