[DOCS] fix broken links

docs/hop-user-manual/modules/ROOT/pages/hop-tools/hop-import.adoc

@@ -22,7 +22,7 @@ Hop Import is a command line tool to import and convert third party metadata to
 
 See also these plugins:
 
-* xref:tech-manual:ROOT:hop-vs-kettle/hop-import.adoc[Kettle Import]
+* xref:tech-manual::hop-vs-kettle/hop-import.adoc[Kettle Import]
 
 == Usage
 

docs/hop-user-manual/modules/ROOT/pages/logging/logging-basics.adoc

@@ -117,8 +117,4 @@ Check xref:../hop-gui/perspective-neo4j.adoc[Neo4j Perspective] page for more de
 
 This transform writes information to the Hop logging system.
 
-Check the xref:../pipeline/transforms/writetolog.adoc[Write To Log] page for more details.
-
-=== External plugins 
-
-The xref:../plugins/external-plugins.adoc[external] hop-plugins repository contains the `Send information using syslog` action and `Send message to syslog` transforms.
+Check the xref:../pipeline/transforms/writetolog.adoc[Write To Log] page for more details.

docs/hop-user-manual/modules/ROOT/pages/technology/google/index.adoc

@@ -34,8 +34,6 @@ We briefly touch upon them below.
 * xref:pipeline/transforms/beamgcppublisher.adoc[GCP Pub/Sub Publisher (Beam)]
 * xref:pipeline/transforms/beamgcpsubscriber.adoc[GCP Pub/Sub Subscriber (Beam)]
 
-Check the xref:plugins/external-plugins.adoc[external plugins] for more information on a number of additional Google plugins that can't be or won't be included with Apache Hop (Google Sheets Input and Output, Google Analytics)
-
 == VFS
 
 Apache xref:vfs.adoc[VFS Support] in Hop allows you to directly read from a multitude of file systems and protocols, including Google: