fix typos in concepts.mdx

apps/docs/pages/appendix/concepts.mdx

@@ -28,7 +28,7 @@ Cache keys contains informations about the query, respectively
 
 ## Cache Invalidation
 
-Hydra's cache invalidation provides a way to invalidate a given cache entry, or a set of cache entries, based schema types.
+Hydra's cache invalidation provides a way to invalidate a given cache entry, or a set of cache entries, based on schema types.
 
 Assuming a mutation that creates a new `Book` in the system, owned by a given `User` type, if the mutation returns the `User` type with its `id` field, then Hydra will automatically invalidate the cached records and every associated records from the cache.
 
@@ -37,4 +37,4 @@ Assuming a mutation that creates a new `Book` in the system, owned by a given `U
 Hydra's rate limiting provides a way to limit the number of requests to a given API in a given time frame.
 This is defined by a rate limit policy, which is a set of rules that define the number of requests that can be made in a given time frame.
 
-For instance, you can define a policy to protect a given endpoint with a rate limit of 100 requests per minute.
+For instance, you can define a policy to protect a given endpoint with a rate limit of 100 requests per minute.