improve span explanations

virtdata-api/src/main/java/io/nosqlbench/engine/api/templating/ParsedSpanType.java

@@ -19,7 +19,7 @@ package io.nosqlbench.engine.api.templating;
 /**
  * The type of a parsed template depends on the structure of the bindings provided.
  */
-public enum BindType {
+public enum ParsedSpanType {
 
     /**
      * A literal template is one which has no bindings that need to be provided to render a specific statement.
@@ -32,7 +32,7 @@ public enum BindType {
      * A bindref template is one which has only a single bind point and no leading or trailing text.
      * It represents a single value which is to be injected, with no clear indication as to whether the
      * value should be in string form or not. These are used when referencing objects by bind point name.
-     * Callers which use rawbind templates where Strings are needed should convert them with {@link Object#toString()}}
+     * Callers which use rawbind templates where Strings are needed should convert them with {@link Object#toString()}
      * Example: <em>{@code {myvalue}}</em>
      */
     bindref,
@@ -40,6 +40,7 @@ public enum BindType {
     /**
      * A string template is one which is neither a literal template nor a bindref template. This includes
      * any template which has any amount of literal text and any template with more than one bind point.
+     * Example: <em>{@code Four {timeunit1} and several {timeunit2} ago}</em>
      */
     concat