Fix typos in documentation (#2493)

Signed-off-by: Ricardo Noriega De Soto <rnoriega@redhat.com>

Author: oglok

docs/design/Certificate Revocation Lists.md

@@ -89,7 +89,7 @@ Load cache is triggerred after cert loaded from the either configurations.
 #### Download CRL
 
 
-Download is implemented by CRL `fetcher`, which can be done in parallel via start tasks in seperate go routines.
+Download is implemented by CRL `fetcher`, which can be done in parallel via start tasks in separate go routines.
 
 CRL download location (URL) can be obtained from the certificate's CRL Distribution Point (CDP) extension.
 `notation-core-go` will download all CDP URLs because each CDP URL may belong to a different scope, and we cannot distinguish them.

docs/proposals/Verify-Latest-N-Artifacts.md

@@ -79,7 +79,7 @@ metadata:
   name: test-verifier
 spec:
   name: # REQUIRED: [string], the unique type of the verifier (notation, cosign)
-  artifactType: # REQUIRED: [string], comma seperated list, artifact type this verifier handles
+  artifactType: # REQUIRED: [string], comma separated list, artifact type this verifier handles
   verifyLastNArtifacts: # Optional: [int], denote the number of attached artfacts that should be verified. only the Last n will be verified. if not defined, all artifacts will be verified.
   address: # OPTIONAL: [string], Plugin path, defaults to value of env "RATIFY_CONFIG" or "~/.ratify/plugins"
   version: # OPTIONAL: [string], Version of the external plugin, defaults to 1.0.0. On ratify initialization, the specified version will be validated against the supported plugin version.