In “Clear”, remove non-existent -CRIT qualifier from LKE CLEAR

In “SHow ”, add information about -NOCRIT and make information about the LOCKSPACEINFO up to date.

In “Clear”, made formatting adjustments and corrected the syntax of the CLEAR command.

In “CLNup”, add new section.

In “SHow ”, specify that SHOW recognizes the full keyword for -CRITICAL.

In “Exercise 2: Rectifying a deadlock situation”, made formatting adjustments for the caution note.