Fixed error in documentation (#1)

The documentation includes a + for a selection of two specific accounts, but the way the select parameters are parsed, the + becomes part of the first id provided.

Author: Niels Wittrup Andersen

src/main/java/io/openapitools/api/capabilities/Select.java

@@ -13,9 +13,9 @@
  * <p>
  * Example:
  * <p>
- * {@code https://banking.services.sample-bank.dk/accounts?select="no::123456789+|no::234567890"}
+ * {@code https://banking.services.sample-bank.dk/accounts?select="no::123456789|no::234567890"}
  * <p>
- * So the {@code select="no::123456789+|no::234567890" }
+ * So the {@code select="no::123456789|no::234567890" }
  * will return the two accounts having account numbers "123456789" and "234567890" and
  * thus it works as a way to select certain objects, in this case based on the semantic
  * key for an account.