Update en/learn/faq.md

Co-authored-by: Kristian Aune <kkraune@users.noreply.github.com>

Author: bratseth

en/learn/faq.md

@@ -87,7 +87,7 @@ of a double. This can happen in two cases:
 
 - The [ranking](../basics/ranking.html) expression used a feature which became `NaN` (Not a Number). For example, `log(0)` would produce
 -Infinity. One can use [isNan](../reference/ranking/ranking-expressions.html#isnan-x) to guard against this.
-- Surfacing low scoring hits using [grouping](../querying/grouping.html), that is, rendering low ranking hits with `each(output(summary()))` that are outside what Vespa computed and caches on a heap. This is controlled by the [total-keep-rank-count](../reference/schemas/schemas.html#total-keep-rank-count) perameter.
+- Surfacing low scoring hits using [grouping](../querying/grouping.html), that is, rendering low ranking hits with `each(output(summary()))` that are outside what Vespa computed and caches on a heap. This is controlled by the [total-keep-rank-count](../reference/schemas/schemas.html#total-keep-rank-count) parameter.
 
 ### How to pin query results?
 To hard-code documents to positions in the result set,