Update memory limits explanation in Container's resource limits documentation

[kolluria]

Clarified memory limits enforcement details and OOM behaviour.

Description

When describing the OOM Kill behaviour of the Kernel in terminating a container, the phrasing However, terminations only happen when the kernel detects memory pressure. is ambiguous as memory pressure usually implies Node Pressure rather than the pressure at a cgroup level.

This change clarifies that description.

Issue

Closes: #

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