Fix typo

Closes dotnet#4504

entity-framework/core/performance/modeling-for-performance.md

@@ -31,7 +31,7 @@ For more perf-sensitive applications, database triggers can be defined to automa
 
 ### Materialized/indexed views
 
-Materialized (or indexed) views are similar to regular views, except that their data is stored on disk ("materialized"), rather than calculated every time the view is queried. Such views are conceptually similar to stored computed columns, as they cache the results of potentially expensive calculations; however, they cache an entire query's resultset instead of a single column. Materialized views can be queried just like any regular table, and since they are cached on disk, such queries execute very quickly and cheaply without havnig to constantly perform the expensive calculations of the query which defines the view.
+Materialized (or indexed) views are similar to regular views, except that their data is stored on disk ("materialized"), rather than calculated every time the view is queried. Such views are conceptually similar to stored computed columns, as they cache the results of potentially expensive calculations; however, they cache an entire query's resultset instead of a single column. Materialized views can be queried just like any regular table, and since they are cached on disk, such queries execute very quickly and cheaply without having to constantly perform the expensive calculations of the query which defines the view.
 
 Specific support for materialized views varies across databases. In some databases (e.g. [PostgreSQL](https://www.postgresql.org/docs/current/rules-materializedviews.html)), materialized views must be manually refreshed in order for their values to be synchronized with their underlying tables. This is typically done via a timer - in cases where some data lag is acceptable - or via a trigger or stored procedure call in specific conditions. [SQL Server Indexed Views](/sql/relational-databases/views/create-indexed-views), on the other hand, are automatically updated as their underlying tables are modified; this ensures that the view always shows the latest data, at the cost of slower updates. In addition, SQL Server Index Views have various restrictions on what they support; consult the [documentation](/sql/relational-databases/views/create-indexed-views) for more information.