Updated install docs to add missing empty cell in directory layout

docs/reference/setup/install/deb.asciidoc

@@ -9,7 +9,7 @@ The latest stable version of Elasticsearch can be found on the
 link:/downloads/elasticsearch[Download Elasticsearch] page. Other versions can
 be found on the link:/downloads/past-releases[Past Releases page].
 
-NOTE: Elasticsearch requires Java 8 or later. Use the 
+NOTE: Elasticsearch requires Java 8 or later. Use the
 http://www.oracle.com/technetwork/java/javase/downloads/index.html[official Oracle distribution]
 or an open-source distribution such as http://openjdk.java.net[OpenJDK].
 
@@ -212,6 +212,7 @@ locations for a Debian-based system:
 | plugins
   | Plugin files location. Each plugin will be contained in a subdirectory.
   | /usr/share/elasticsearch/plugins
+  |
 
 | repo
   | Shared file system repository locations. Can hold multiple locations. A file system repository can be placed in to any subdirectory of any directory specified here.

docs/reference/setup/install/rpm.asciidoc

@@ -204,6 +204,7 @@ locations for an RPM-based system:
 | plugins
   | Plugin files location. Each plugin will be contained in a subdirectory.
   | /usr/share/elasticsearch/plugins
+  |
 
 | repo
   | Shared file system repository locations. Can hold multiple locations. A file system repository can be placed in to any subdirectory of any directory specified here.

docs/reference/setup/install/windows.asciidoc

@@ -248,6 +248,7 @@ directory so that you do not delete important data later on.
 | plugins
   | Plugin files location. Each plugin will be contained in a subdirectory.
   | %ES_HOME%\plugins
+  |
 
 | repo
   | Shared file system repository locations. Can hold multiple locations. A file system repository can be placed in to any subdirectory of any directory specified here.