CDM-67 fixing inconsistency between config and doc

Author: mieslep

src/main/java/com/datastax/cdm/properties/KnownProperties.java

@@ -100,7 +100,7 @@ public enum PropertyType {
     public static final String PERF_NUM_PARTS                   = "spark.cdm.perfops.numParts";             // 10000, was spark.splitSize
     public static final String PERF_BATCH_SIZE                  = "spark.cdm.perfops.batchSize";             // 5
     public static final String PERF_LIMIT_READ                  = "spark.cdm.perfops.readRateLimit";         // 20000
-    public static final String PERF_LIMIT_READ_TARGET           = "spark.cdm.perfops.readRateLimit.target";  // readRateLimit
+    public static final String PERF_LIMIT_READ_TARGET           = "spark.cdm.perfops.readRateLimitTarget";   // readRateLimit
     public static final String PERF_LIMIT_WRITE                 = "spark.cdm.perfops.writeRateLimit";        // 40000
 
     public static final String READ_CL                          = "spark.cdm.perfops.consistency.read";