ORC-1564: Add Java ORC configuration documentation

### What changes were proposed in this pull request?

### Why are the changes needed?
ORC Java has a lot of configuration items, but there is no page for users to view.

### How was this patch tested?

Closes #1713 from cxzl25/ORC-1564.

Authored-by: sychen <[email protected]>
Signed-off-by: William Hyun <[email protected]>

java/core/src/java/org/apache/orc/OrcConf.java

@@ -163,7 +163,7 @@ public enum OrcConf {
       "Hive 2.1."),
   FORCE_POSITIONAL_EVOLUTION_LEVEL("orc.force.positional.evolution.level",
       "orc.force.positional.evolution.level", 1,
-      "Require schema evolution to match the the defined no. of level columns using position\n" +
+      "Require schema evolution to match the defined no. of level columns using position\n" +
           "rather than column names. This provides backwards compatibility with Hive 2.1."),
   ROWS_BETWEEN_CHECKS("orc.rows.between.memory.checks", "orc.rows.between.memory.checks", 5000,
     "How often should MemoryManager check the memory sizes? Measured in rows\n" +
@@ -219,7 +219,7 @@ public enum OrcConf {
                          + "optimization"),
   ORC_MIN_DISK_SEEK_SIZE_TOLERANCE("orc.min.disk.seek.size.tolerance",
                           "orc.min.disk.seek.size.tolerance", 0.00,
-                          "Define the tolerance for for extra bytes read as a result of "
+                          "Define the tolerance for extra bytes read as a result of "
                           + "orc.min.disk.seek.size. If the "
                           + "(bytesRead - bytesNeeded) / bytesNeeded is greater than this "
                           + "threshold then extra work is performed to drop the extra bytes from "

site/_data/docs.yml

@@ -34,6 +34,7 @@
   docs:
   - core-java
   - core-cpp
+  - core-java-config
 
 - title: Tools
   docs: