update references to just compose (#1869)

#### What type of PR is this?

Change from Docker Compose references to just Compose

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#### What this PR does / why we need it:

Compose is an open format and we should not say "Docker Compose".

#### Which issue(s) this PR fixes:
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Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
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Fixes https://github.com/kubernetes/kompose/issues/1868

#### Special notes for your reviewer:

Signed-off-by: Charlie Drage <charlie@charliedrage.com>

pkg/loader/compose/compose.go

@@ -250,7 +250,7 @@ func convertDockerLabel(dockerLabel string) (string, error) {
 	return "", errors.New(errMsg)
 }
 
-// Convert the Docker Compose volumes to []string (the old way)
+// Convert the Compose volumes to []string (the old way)
 // TODO: Check to see if it's a "bind" or "volume". Ignore for now.
 // TODO: Refactor it similar to loadPorts
 // See: https://docs.docker.com/compose/compose-file/#long-syntax-3
@@ -273,7 +273,7 @@ func loadVolumes(volumes []types.ServiceVolumeConfig) []string {
 	return volArray
 }
 
-// Convert Docker Compose ports to kobject.Ports
+// Convert Compose ports to kobject.Ports
 // expose ports will be treated as TCP ports
 func loadPorts(ports []types.ServicePortConfig, expose []string) []kobject.Ports {
 	komposePorts := []kobject.Ports{}