[IMPROVEMENT] Adjust wording of Members in Directory

[rafaelks]

@RocketChat/ios

[codecov]

Codecov Report

Merging #2604 into develop will increase coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2604      +/-   ##
===========================================
+ Coverage       26%   26.12%   +0.11%     
===========================================
  Files          463      463              
  Lines        17209    17209              
===========================================
+ Hits          4476     4496      +20     
+ Misses       12733    12713      -20

Impacted Files	Coverage Δ
...ocket.Chat/Extensions/Models/ObjectExtension.swift	80% <0%> (-20%)	⬇️
...ontrollers/Base/Main/MainSplitViewController.swift	45% <0%> (-7.5%)	⬇️
...Chat/Controllers/Chat/MessagesViewController.swift	31.49% <0%> (-2.76%)	⬇️
Rocket.Chat/Managers/PushManager.swift	27.58% <0%> (+3.44%)	⬆️
Rocket.Chat/Managers/AppManager.swift	40.11% <0%> (+4.06%)	⬆️
Rocket.Chat/Extensions/Models/AuthExtensions.swift	100% <0%> (+33.33%)	⬆️
...anagers/Model/AuthManager/AuthManagerRecover.swift	96.96% <0%> (+60.6%)	⬆️

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