Update pull and pull-always in bud man page
Update the `--pull` and `--pull-always` documentation in the build
command to clarify what each does.
Fixes:
@@ -288,13 +288,21 @@ process.
**--pull**
-Pull the image if it is not present. If this flag is disabled (with
-*--pull=false*) and the image is not present, the image will not be pulled.
+When the flag is enabled, attempt to pull the latest image from the registries
+listed in registries.conf if a local image does not exist or the image is newer
+than the one in storage. Raise an error if the image is not in any listed
+registry and is not present locally.
+
+If the flag is disabled (with *--pull=false*), do not pull the image from the
+registry, use only the local version. Raise an error if the image is not
+present locally.
+
Defaults to *true*.
**--pull-always**
-Pull the image even if a version of the image is already present.
+Pull the image from the first registry it is found in as listed in registries.conf.
+Raise an error if not found in the registries, even if the image is present locally.
**--quiet, -q**
