docs: Clarify credential store behavior (#5686)

* docs: Clarify credential store behavior

* docs: Update credential libraries phrasing

* docs: Update phrasing for lead in sentence

website/content/docs/concepts/domain-model/credential-stores.mdx

@@ -8,20 +8,27 @@ description: >-
 # Credential stores
 
 A credential store is a resource
-that can retrieve, store, and potentially generate [credentials][]
+that can retrieve [credentials][]
 of differing types and differing access levels.
 It belongs to a [project][] and supports the
 [principle of least privilege](https://en.wikipedia.org/wiki/Principle_of_least_privilege)
 by providing mechanisms to limit the [credentials][] it can access
 to the minimum necessary for the project it is in.
-A credential store can also contain [credential libraries][].
+
+Credential stores contain either credential libraries or credentials, depending on the type:
+
+- Vault credential stores contain [credential libraries][].
+   Targets use credential libraries to issue credentials for sessions.
+
+- Static credential stores contain credentials, not credential libraries.
+   When you use static credential stores, the credentials are stored directly in Boundary.
 
 ## Attributes
 
 A credential store has the following configurable attributes:
 
 - `name` - (optional)
-  If set, the `name` must be unique within the credential store's [project][].
+  If set, the `name` must be unique within the credential store's project.
 
 - `description` - (optional)
 
@@ -63,7 +70,7 @@ A Vault credential store has the following additional attributes:
   This allows the use of private Vault instances with Boundary. Workers
   deployed in the same network as a private Vault instance can access and relay
   Vault requests to Boundary controllers.
-  ~> **Note:** A worker that matches the worker filter must exist before defining the Vault credential store, as it
+  A worker that matches the worker filter must exist before defining the Vault credential store, as it
   will perform the Vault calls needed to set up the credential store with Boundary.
 
 ### Static credential store attributes
@@ -99,7 +106,7 @@ All tokens must also have the capabilities of the
 ### Vault policies
 
 The credential store's token must have the capabilities to issue credentials for
-each of it's [credential libraries][] plus the capabilities of the
+each of its credential libraries plus the capabilities of the
 [Vault Boundary Controller Policy][token_policy] described below.
 
 We recommend creating a unique Vault policy for each Vault credential store that