Merge pull request #4129 from adamretter/doc/jline-jansi-comment

[doc] Add a comment about the requirement for jansi

Author: duncdrum

exist-core/pom.xml

@@ -199,6 +199,10 @@
             <groupId>org.fusesource.jansi</groupId>
             <artifactId>jansi</artifactId>
             <version>2.4.0</version>
+            <!--
+                Optionally used by jline at runtime on Linux and macOS,
+                and required by jline at runtime on Windows.
+            -->
             <scope>runtime</scope>
         </dependency>