DDS11 — Spell fully the names for the DataReader operations

In some class diagrams, generic operations are indicated using 'xxx' in their names instead of fully specifying all the real operations and also some operations are missing.
Resolution:

• add the missing operations for the dataReader
• explicitly mention all operations for the dataReader
  Revised Text:
  In the class diagram Fig. 2-8 on page 2-39:
• add missing operations "read_w_condition", "take_w_condition" and "return_loan".
• rename "read_xxx_w_conditon" into "read_next_w_condition".
• rename "take_xxx_w_condition" into "take_next_w_condition"

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