updated links (#1816)

Signed-off-by: Sally MacFarlane <sally.macfarlane@consensys.net>

.github/issue_template.md

@@ -1,9 +1,9 @@
 <!-- Have you done the following? -->
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-<!--     https://github.com/hyperledger/besu/blob/master/CODE-OF-CONDUCT.md -->
+<!--     https://github.com/hyperledger/besu/blob/master/CODE_OF_CONDUCT.md -->
 <!--   * Reproduced the issue in the latest version of the software -->
-<!--   * Read the debugging wiki: https://github.com/hyperledger/besu/wiki/debugging -->
+<!--   * Read the debugging docs: https://besu.hyperledger.org/en/stable/HowTo/Monitor/Logging/ -->
 <!--   * Duplicate Issue check:  https://github.com/search?q=+is%3Aissue+repo%3Ahyperledger/Besu -->
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