[stmt.do] Add comma after introductory phrase

Eisenwave · jensmaurer · commit d5ad37949374 · 2024-02-28T12:44:14.000+01:00
diff --git a/source/statements.tex b/source/statements.tex
@@ -598,7 +598,7 @@
 if that conversion is ill-formed, the program is ill-formed.
 
 \pnum
-In the \keyword{do} statement the substatement is executed repeatedly
+In the \keyword{do} statement, the substatement is executed repeatedly
 until the value of the expression becomes \tcode{false}. The test takes
 place after each execution of the statement.
 
