update broken link, issue template (#6829)

Signed-off-by: Matt Nelson <[email protected]>
Co-authored-by: Sally MacFarlane <[email protected]>

.github/issue_template.md

@@ -3,7 +3,7 @@
 <!--     comply with it, including treating everyone with respect: -->
 <!--     https://github.com/hyperledger/besu/blob/main/CODE_OF_CONDUCT.md -->
 <!--   * Reproduced the issue in the latest version of the software -->
-<!--   * Read the debugging docs: https://besu.hyperledger.org/en/stable/HowTo/Monitor/Logging/ -->
+<!--   * Read the debugging docs: https://besu.hyperledger.org/private-networks/how-to -->
 <!--   * Duplicate Issue check:  https://github.com/search?q=+is%3Aissue+repo%3Ahyperledger/Besu -->
 <!-- Note:  Not all sections will apply to all issue types. -->