Add a note about array addition to the "PowerShell scripting performance considerations" page (MicrosoftDocs#12106)

* Add a note about array addition

* Update script-authoring-considerations.md

* Update script-authoring-considerations.md

---------

Co-authored-by: Sean Wheeler <[email protected]>

Author: SP3269

reference/docs-conceptual/dev-cross-plat/performance/script-authoring-considerations.md

@@ -113,6 +113,11 @@ $results += Get-SomethingElse
 $results
 ```
 
+>[!NOTE]
+> In PowerShell 7.5, array addition was optimized and no longer creates a new array for each
+> operation. The performance considerations described here still apply to PowerShell versions
+> prior to 7.5. For more information, see [What's New in PowerShell 7.5][01].
+
 Array addition is inefficient because arrays have a fixed size. Each addition to the array creates
 a new array big enough to hold all elements of both the left and right operands. The elements of
 both operands are copied into the new array. For small collections, this overhead may not matter.
@@ -880,21 +885,22 @@ Iterations Test                                 TotalMilliseconds RelativeSpeed
 - [Add-Member][18]
 
 <!-- Link reference definitions -->
+[01]: ../../whats-new/what-s-new-in-powershell-75.md#engine-improvements
 [02]: ../../learn/deep-dives/everything-about-hashtable.md
 [03]: ../../learn/deep-dives/everything-about-null.md
 [04]: xref:System.Void
 [05]: xref:Microsoft.PowerShell.Core.Out-Null
 [06]: xref:System.Collections.Generic.List`1
-[07]: xref:System.Collections.Generic.List`1.Add*
+[07]: xref:System.Collections.Generic.List`1.Add%2A
 [08]: xref:System.String
 [09]: xref:System.Int32
 [10]: xref:System.Object
-[11]: xref:System.Collections.Generic.List`1.ToArray*#system-collections-generic-list-1-toarray
+[11]: xref:System.Collections.Generic.List%601.ToArray%2A#system-collections-generic-list-1-toarray
 [12]: xref:System.Collections.ArrayList
 [13]: /powershell/module/microsoft.powershell.core/about/about_join
 [14]: xref:System.Text.StringBuilder
 [15]: xref:System.IO.StreamReader
-[16]: xref:System.IO.File.ReadLines*
+[16]: xref:System.IO.File.ReadLines%2A
 [17]: xref:Microsoft.PowerShell.Utility.Write-Host
 [18]: xref:Microsoft.PowerShell.Utility.Add-Member
 [19]: /powershell/module/microsoft.powershell.core/about/about_hash_tables#creating-ordered-dictionaries