docs: fix broken links (#1171)

* docs: fix broken links

Signed-off-by: Nao Yonashiro <owan.orisano@gmail.com>

Author: orisano

docs/content/1.1.0/java-agent/_index.md

@@ -18,6 +18,6 @@ The JMX Exporter Java agent jar file is published via GitHub Releases.
 
 Installation depends on which modes you want to support:
 
-- [HTTP mode](/java-agent/http-mode/)
-- [OpenTelemetry mode](/java-agent/opentelemetry-mode/)
-- [Combined mode](/java-agent/combined-mode/)
+- [HTTP mode](./http-mode/)
+- [OpenTelemetry mode](./opentelemetry-mode/)
+- [Combined mode](./combined-mode/)

docs/content/1.2.0/java-agent/_index.md

@@ -18,6 +18,6 @@ The JMX Exporter Java agent jar file is published via GitHub Releases.
 
 Installation depends on which modes you want to support:
 
-- [HTTP mode](/java-agent/http-mode/)
-- [OpenTelemetry mode](/java-agent/opentelemetry-mode/)
-- [Combined mode](/java-agent/combined-mode/)
+- [HTTP mode](./http-mode/)
+- [OpenTelemetry mode](./opentelemetry-mode/)
+- [Combined mode](./combined-mode/)