Update repeat.qmd

Fix spacing issue

tutorial_pages/repeat.qmd

@@ -1,6 +1,7 @@
 # Repetition
 
 The function 
+
 * `replicate(nrep, expression)` repeats the `expression` provided `nrep` times.
 
 e.g. `replicate(10, mean(rnorm(100)))` reads: 'draw 100 values from a normal distribution with a mean 0 and sd 1 (the default values), calculate the mean of these 100 values, and do all that 10 times.'