Replace sha256 with sha512 on download page

Author: ppkarwasz

src/site/antora/modules/ROOT/pages/download.adoc

@@ -45,7 +45,7 @@ You can download the source code of the latest Apache Log4j release using the li
 | {dist-url}/apache-log4j-{log4j-core-version}-src.zip[apache-log4j-{log4j-core-version}-src.zip]
 
 | Checksum
-| {dist-url}/apache-log4j-{log4j-core-version}-src.zip.sha256[apache-log4j-{log4j-core-version}-src.zip.sha256]
+| {dist-url}/apache-log4j-{log4j-core-version}-src.zip.sha512[apache-log4j-{log4j-core-version}-src.zip.sha512]
 
 | Signature
 | {dist-url}/apache-log4j-{log4j-core-version}-src.zip.asc[apache-log4j-{log4j-core-version}-src.zip.asc]
@@ -80,7 +80,7 @@ All the artifacts in the ASF Nexus repository are also available in a single ZIP
 | {dist-url}/apache-log4j-{log4j-core-version}-bin.zip[apache-log4j-{log4j-core-version}-bin.zip]
 
 | Checksum
-| {dist-url}/apache-log4j-{log4j-core-version}-bin.zip.sha256[apache-log4j-{log4j-core-version}-src.bin.sha256]
+| {dist-url}/apache-log4j-{log4j-core-version}-bin.zip.sha512[apache-log4j-{log4j-core-version}-src.bin.sha512]
 
 | Signature
 | {dist-url}/apache-log4j-{log4j-core-version}-bin.zip.asc[apache-log4j-{log4j-core-version}-src.bin.asc]