Werk #18591: 3par_capacity: Various UX improvements

Component	Checks & agents
Title	3par_capacity: Various UX improvements
Date	Sep 16, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p14 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

This improves the usablility of the "HPE 3PAR: Capacity" plug-in:

• Clarified output format of the failed capacity
• Clarified the default levels of the failed capacity (which are zero, any failed sectors lead to a CRIT)

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