Cross reference controller-docs with upstreams.
Change-Id: I2143d6971b4bf4bceab331e350c7363755b03a4a
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
<link>https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/</link>
<link>https://commons.apache.org/proper/commons-lang/javadocs/api-3.9/</link>
<link>https://commons.apache.org/proper/commons-codec/apidocs/</link>
+
+ <link>https://www.javadoc.io/doc/org.opendaylight.yangtools/yangtools-docs/4.0.2/</link>
+ <link>https://www.javadoc.io/doc/org.opendaylight.mdsal/mdsal-docs/5.0.4/</link>
</links>
<groups>
<group>