fixed wrong parentheses

Author: thomasWeise

text/main/basics/simpleDataTypesAndOperations/str/str.tex

@@ -279,7 +279,7 @@
 \pythonil{f"Single braces without expression: \{\{ and \}\}."} simply becomes \pythonil{"Single braces without expression: \{ and \}."}
 
 As final example, let us look at a very cool ability of \pglspl{fstring}\pythonIdx{f-string!=}.
-Often, we want to print an expression together with its result~\cite(PSF2024WNIP38FSFSDEAD).
+Often, we want to print an expression together with its result~\cite{PSF2024WNIP38FSFSDEAD}.
 Earlier, we wrote \pythonil{f"\{5\}\ + \{4\}\ = \{5 + 4\}"} is evaluated to \pythonil{"5 + 4 = 9"}.
 What we actually wanted to print was the expression \pythonil{5 + 4} together with its result.
 This can be done much easier: