treewide: fix a few typos in NEWS, docs and comments

docs/CREDENTIALS.md

@@ -34,7 +34,7 @@ purpose. Specifically, the following features are provided:
    environment variables the credential data is not propagated down the process
    tree. Instead each time a credential is accessed an access check is enforced
    by the kernel. If the service is using file system namespacing the loaded
-   credential data is invisible to any other services.
+   credential data is invisible to all other services.
 
 4. Service credentials may be acquired from files on disk, specified as literal
    strings in unit files, acquired from another service dynamically via an

docs/NETWORK_ONLINE.md

@@ -28,7 +28,7 @@ avoiding an unnecessary synchronization point.
 ## Network management services: `network.target`
 
 `network.target` indicates that the network management stack has been started.
-Ordering after it it has little meaning during start-up: whether any network
+Ordering after it has little meaning during start-up: whether any network
 interfaces are already configured when it is reached is not defined.
 
 Its primary purpose is for ordering things properly at shutdown: since the

docs/USER_RECORD.md

@@ -212,7 +212,7 @@ object. The following fields are currently defined:
 
 `userName` → The UNIX user name for this record. Takes a string with a valid
 UNIX user name. This field is the only mandatory field, all others are
-optional. Corresponds with the `pw_name` field of of `struct passwd` and the
+optional. Corresponds with the `pw_name` field of `struct passwd` and the
 `sp_namp` field of `struct spwd` (i.e. the shadow user record stored in
 `/etc/shadow`). See [User/Group Name Syntax](USER_NAMES.md) for
 the (relaxed) rules the various systemd components enforce on user/group names.