Fix typo pattnr (#1316)

Author: ReneNyffenegger

website/src/pages/learn/stepwise.mdx

@@ -24,7 +24,7 @@ With the new stepwise `stepcat` function, the steps of the two patterns will be
 
 By default, steps are counted according to the 'top level' in mini-notation. For example `"a [b c] d e"` has five events in it per cycle, but is counted as four steps, where `[b c]` is counted as a single step.
 
-However, you can mark a different metrical level to count steps relative to, using a `^` at the start of a sub-pattern. If we do this to the subpattern in our example: `"a [^b c] d e"`, then the pattern is now counted as having _eight_ steps. This is because 'b' and 'c' are each counted as single steps, and the events in the pattenr are twice as long, and so counted as two steps each.
+However, you can mark a different metrical level to count steps relative to, using a `^` at the start of a sub-pattern. If we do this to the subpattern in our example: `"a [^b c] d e"`, then the pattern is now counted as having _eight_ steps. This is because 'b' and 'c' are each counted as single steps, and the events in the pattern are twice as long, and so counted as two steps each.
 
 ## Pacing the steps