Update text in indentation.md

Author: odersky

docs/docs/reference/other-new-features/indentation.md

@@ -3,14 +3,13 @@ layout: doc-page
 title: Optional Braces
 ---
 
-As an experimental feature, Scala 3 enforces some rules on indentation and allows
-some occurrences of braces `{...}` to be optional.
-It can be turned off with the compiler flag `-noindent`.
+Scala 3 enforces some rules on indentation and allows some occurrences of braces `{...}` to be optional:
 
 - First, some badly indented programs are flagged with warnings.
 - Second, some occurrences of braces `{...}` are made optional. Generally, the rule
  is that adding a pair of optional braces will not change the meaning of a well-indented program.
 
+These changescan can be turned off with the compiler flag `-noindent`.
 ### Indentation Rules
 
 The compiler enforces two rules for well-indented programs, flagging violations as warnings.