Add Security considerations section to access-api-from-pod task

[singhvishalkr]

The page describes how a Pod authenticates to the API server (ServiceAccount token, in-cluster CA, kubectl proxy, raw curl) but stops short of the operational hygiene that goes with that access. Issue #55660 asks for a short security-considerations block tied to the same flow.

This change appends a ## Security considerations section at the end of the existing API-access steps. It covers four things, each with a concrete in-tree link:

• prefer a dedicated ServiceAccount per workload over the namespace default
• scope permissions through RBAC, with Role/RoleBinding favored over ClusterRole when one namespace is enough
• set automountServiceAccountToken: false on Pods that do not need API access at all
• re-evaluate whether direct API access is still the right design (controller, webhook, or out-of-cluster reader as alternatives)

Single file, +25 lines, no behavioural code touched.

Closes #55660

NONE

/sig docs
/kind documentation
/language en

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[singhvishalkr]

/assign @sayanchowdhury