docs: fix typo

Signed-off-by: rare-magma <[email protected]>

README.md

@@ -86,7 +86,7 @@ I frequently add a new expense before I purchase it so I can see the impact on t
 If everything went according to plan, once I receive a new salary, I transfer the value in the `savings estimate` field to my bank savings account.
 
 Later, I can compare the budget with previous months to understand where the money is going by hovering the mouse/tapping on a single expense. A tooltip pops up and shows its value in percentage of revenue (see the tooltip screenshot above).
-The charts page is useful for these kinds of insighs.
+The charts page is useful for these kinds of insights.
 
 There I can see an overview of the evolution of several metrics such as `savings`, `revenue`, etc. If I want to narrow down the chart to a specific type of item I can search for it in the filter searchbox. If I toggle the `strict match` button then only items that are named exactly as the search value are shown in the resulting chart.