Fix docs for attestation client HTTP headers

tpm/attestation/requestid.go

@@ -23,7 +23,7 @@ func RequestIDFromContext(ctx context.Context) (string, bool) {
 }
 
 // requestIDHeader is the header name used for propagating request IDs from
-// the CA client to the CA and back again.
+// the attestation client to the attestation CA and back again.
 const requestIDHeader = "X-Request-Id"
 
 // newRequestID generates a new random UUIDv4 request ID. If it fails,

tpm/attestation/useragent.go

@@ -2,9 +2,11 @@ package attestation
 
 import "net/http"
 
-// UserAgent will set the User-Agent header in the client requests.
+// UserAgent is the value of the User-Agent HTTP header that will
+// be set in HTTP requests to the attestation CA.
 var UserAgent = "step-attestation-http-client/1.0"
 
+// setUserAgent sets the User-Agent header in HTTP requests.
 func setUserAgent(r *http.Request) {
 	r.Header.Set("User-Agent", UserAgent)
 }