cli: Mention filter key prefixes in eACL creation command

[alexvanin]

Asked by @EliChin

[codecov]

Codecov Report

Merging #1200 (a99b3cf) into master (e0dce10) will not change coverage.
The diff coverage is n/a.

❗ Current head a99b3cf differs from pull request most recent head 0bc20b4. Consider uploading reports for the commit 0bc20b4 to get more accurate results

@@           Coverage Diff           @@
##           master    #1200   +/-   ##
=======================================
  Coverage   35.54%   35.54%           
=======================================
  Files         284      284           
  Lines       17939    17939           
=======================================
  Hits         6376     6376           
  Misses      11078    11078           
  Partials      485      485           

Impacted Files	Coverage Δ
cmd/neofs-cli/modules/acl/extended/create.go	53.28% <ø> (ø)

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