fix 2 javac warnings: [dep-ann] deprecated item is not annotated with @Deprecated

    [javac] /Users/cpoerschke/git/solr/solrj/src/java/org/apache/solr/client/solrj/request/UpdateRequest.java:63: warning: [dep-ann] deprecated item is not annotated with @Deprecated
    [javac]   public static final String MIN_REPFACT = "min_rf";
    [javac]                              ^
    [javac] /Users/cpoerschke/git/solr/solrj/src/java/org/apache/solr/common/params/CommonParams.java:276: warning: [dep-ann] deprecated item is not annotated with @Deprecated
    [javac]   String PREFER_LOCAL_SHARDS = "preferLocalShards";
    [javac]          ^