Remove solution from single compilation unit explanation

A solution can, for example, contain multiple console applications.

Co-authored-by: Bill Wagner <[email protected]>

Author: BartoszKlonowski

docs/csharp/language-reference/compiler-messages/cs8802.md

@@ -11,7 +11,7 @@ helpviewer_keywords:
 
 Only one compilation unit can have top-level statements.
 
-This error indicates that there are two or more [top-level statements](../../fundamentals/program-structure/top-level-statements.md) in a single compilation unit (single solution, project or a single group of files compiled into a single binary file).
+This error indicates that there are two or more [top-level statements](../../fundamentals/program-structure/top-level-statements.md) in a single compilation unit (single project or a single group of files compiled into a single binary file).
 
 ## Example