docs: minor edits to docs (#370)

* minor edits to docs

Signed-off-by: Trishank Karthik Kuppusamy <[email protected]>

* Update verification.md

Signed-off-by: Trishank Karthik Kuppusamy <[email protected]>

* Update verification.md

Signed-off-by: Trishank Karthik Kuppusamy <[email protected]>

* Update signed_entity.go

`WithoutAnyObserverTimestampsUnsafe` doesn't seem to exist anymore

Signed-off-by: Trishank Karthik Kuppusamy <[email protected]>

---------

Signed-off-by: Trishank Karthik Kuppusamy <[email protected]>

Author: trishankatdatadog

docs/signing.md

@@ -12,7 +12,7 @@ This document will walk you through using `sigstore-go` to generate a Sigstore b
 Clone this repository and run the following command:
 
 ```shell
-$ make examples
+$ make build-examples
 $ go install ./examples/sigstore-go-signing
 ```
 

docs/verification.md

@@ -63,12 +63,8 @@ Going through this step-by-step, we'll start by loading the trusted root from th
 	if err != nil {
 		panic(err)
 	}
-	trustedrootJSON, err := client.GetTarget("trusted_root.json")
-	if err != nil {
-		panic(err)
-	}
 
-	trustedMaterial, err := root.NewTrustedRootFromJSON(trustedrootJSON)
+	trustedMaterial, err := root.GetTrustedRoot(client)
 	if err != nil {
 		panic(err)
 	}
@@ -201,12 +197,8 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-	trustedrootJSON, err := client.GetTarget("trusted_root.json")
-	if err != nil {
-		panic(err)
-	}
 
-	trustedMaterial, err := root.NewTrustedRootFromJSON(trustedrootJSON)
+	trustedMaterial, err := root.GetTrustedRoot(client)
 	if err != nil {
 		panic(err)
 	}

pkg/verify/signed_entity.go

@@ -192,7 +192,7 @@ func WithCurrentTime() VerifierOption {
 func (c *VerifierConfig) Validate() error {
 	if !c.requireObserverTimestamps && !c.requireSignedTimestamps && !c.requireIntegratedTimestamps && !c.useCurrentTime {
 		return errors.New("when initializing a new SignedEntityVerifier, you must specify at least one of " +
-			"WithObserverTimestamps(), WithSignedTimestamps(), WithIntegratedTimestamps(), or WithoutAnyObserverTimestampsUnsafe()")
+			"WithObserverTimestamps(), WithSignedTimestamps(), or WithIntegratedTimestamps()")
 	}
 
 	return nil