Improve clarity on README

Signed-off-by: Paulo Gomes <[email protected]>

Author: pjbgf

README.md

@@ -23,8 +23,8 @@ slsactl download provenance rancher/cis-operator:v1.0.15
 slsactl download provenance --format=slsav1 rancher/cis-operator:v1.0.15
 ```
 
-By default, the returned provenance would be for `linux/amd64`. To select a
-different platform use `--platform`.
+By default, the returned provenance will be for `linux/amd64`, if one exists.
+To select a different platform use `--platform`.
 
 ### SBOM
 The latest container images have baked into them a layer containing their SPDX
@@ -40,8 +40,8 @@ If Cyclonedx is required instead:
 slsactl download sbom -format cyclonedxjson rancher/cis-operator:v1.0.15
 ```
 
-By default, the returned provenance would be for `linux/amd64`. To select a
-different platform use `--platform`.
+By default, the returned provenance will be for `linux/amd64`, if one exists.
+To select a different platform use `--platform`.
 
 Note that images that haven't got a SBOM layer attached to them, the same
 command will generate a SBOM manifest on-demand, which will take longer.