Werk #12925: sap_hana_memrate: Fix graph for memory used

Component	Checks & agents
Title	sap_hana_memrate: Fix graph for memory used
Date	Jul 6, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Graph for memory used didn't have units displayed. Now, units are displayed and the title is nicer.

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