Lowercase one of the memory suffixes

Upper case 'K' suffix for memory results in an invalid request.

Author: rahdeck

content/en/docs/concepts/configuration/manage-resources-containers.md

@@ -115,7 +115,7 @@ CPU is always requested as an absolute quantity, never as a relative quantity;
 
 Limits and requests for `memory` are measured in bytes. You can express memory as
 a plain integer or as a fixed-point number using one of these suffixes:
-E, P, T, G, M, K. You can also use the power-of-two equivalents: Ei, Pi, Ti, Gi,
+E, P, T, G, M, k. You can also use the power-of-two equivalents: Ei, Pi, Ti, Gi,
 Mi, Ki. For example, the following represent roughly the same value:
 
 ```shell