Update topic-and-subscription.md (microsoft#3901)

python/packages/autogen-core/docs/src/user-guide/core-user-guide/core-concepts/topic-and-subscription.md

@@ -76,7 +76,7 @@ For Python API, use {py:class}`~autogen_core.components.TypeSubscription`.
 Type-Based Subscription = Topic Type --> Agent Type
 ```
 
-Generally speaking, type-based subscription is the preferred way to delcare
+Generally speaking, type-based subscription is the preferred way to declare
 subscriptions. It is portable and data-independent:
 developers do not need to write application code that depends on specific agent IDs.
 
@@ -208,4 +208,4 @@ of the agent
 if it does not exist.
 
 To support multiple topics per tenant, you can use different topic types,
-just like the single-tenant, multiple topics scenario.
+just like the single-tenant, multiple topics scenario.