[PowerToysRun][Docs] Add QuickAI plugin to third-party plugins list (#43238)

Adds QuickAI plugin to the third-party plugins documentation.

QuickAI is an AI-powered assistance plugin that provides instant, smart
responses from multiple providers (Groq, Together, Fireworks,
OpenRouter, Cohere) directly in PowerToys Run.

Repository: https://github.com/ruslanlap/PowerToysRun-QuickAi

---------

Co-authored-by: Niels Laute <niels.laute@live.nl>

.github/actions/spell-check/allow/code.txt

@@ -95,6 +95,7 @@ OTP
 Yubi
 Yubico
 Perplexity
+Groq
 svgl
 
 # KEYS

.github/actions/spell-check/expect.txt

@@ -221,6 +221,7 @@ clientside
 CLIPBOARDUPDATE
 CLIPCHILDREN
 CLIPSIBLINGS
+CLITo
 closesocket
 clp
 CLSCTX
@@ -728,9 +729,9 @@ HWNDPARENT
 HWNDPREV
 hyjiacan
 IAI
-icf
 ICONERROR
 ICONLOCATION
+icf
 IDCANCEL
 IDD
 idk
@@ -1073,6 +1074,7 @@ MVVMTK
 MWBEx
 MYICON
 NAMECHANGE
+Notavailable
 namespaceanddescendants
 nao
 NCACTIVATE