Properly fix JavaDoc linting issues

Fixes our own, and upstream's, issues with the stricter Java 8 JavaDoc
linter.

Also removes the destroystokyo-release maven repository. I'm not sure
why I added it originally, but it's unnecessary now.

Spigot-API-Patches/POM-changes.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] POM changes
 
 
 diff --git a/pom.xml b/pom.xml
-index ecb870a0..48c2e544 100644
+index ecb870a0..968f9091 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -37,7 +37,6 @@ index ecb870a0..48c2e544 100644
 -        <maven.compiler.source>1.6</maven.compiler.source>
 -        <maven.compiler.target>1.6</maven.compiler.target>
 +        <!-- Paper - Bump to 1.8 - Because Duh... -->
-+        <additionalparam>-Xdoclint:none</additionalparam>
 +        <maven.compiler.source>1.8</maven.compiler.source>
 +        <maven.compiler.target>1.8</maven.compiler.target>
          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>