[backport] times/getClockStr(): fix mistake in doc (nim-lang#13229) [ci skip]

(cherry picked from commit 3e843ab)

Author: Milan

lib/pure/times.nim

@@ -1304,7 +1304,7 @@ proc getDateStr*(dt = now()): string {.rtl, extern: "nt$1", tags: [TimeEffect].}
     '-' & intToStr(dt.monthday, 2)
 
 proc getClockStr*(dt = now()): string {.rtl, extern: "nt$1", tags: [TimeEffect].} =
-  ## Gets the current local clock time as a string of the format ``HH:MM:SS``.
+  ## Gets the current local clock time as a string of the format ``HH:mm:ss``.
   runnableExamples:
     echo getClockStr(now() - 1.hours)
   result = intToStr(dt.hour, 2) & ':' & intToStr(dt.minute, 2) &