Werk #18484: Improve inline help for "Filesystem grouping patterns"

Component	Checks & agents
Title	Improve inline help for "Filesystem grouping patterns"
Date	Feb 26, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	3.0.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.3.0p43 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Previously "Filesystem grouping patterns" explicitly mentioned df, although this plugin is no longer influenced by this rule since Werk #14100

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