Improve docs for checker and downloader

* make it more clear that a domain can also be interpreted as a direct URL.

resolve #316 
---------

Co-authored-by: JanHoefelmeyer <hoefelmeyer.jan@gmail.com>
Co-authored-by: Sascha L. Teichmann <sascha.teichmann@intevation.de>
Co-authored-by: Bernhard Reiter <bernhard@intevation.de>

cmd/csaf_checker/main.go

@@ -162,7 +162,7 @@ func buildReporters() []reporter {
 	}
 }
 
-// run uses a processor to check all the given domains
+// run uses a processor to check all the given domains or direct urls
 // and generates a report.
 func run(opts *options, domains []string) (*Report, error) {
 	p, err := newProcessor(opts)
@@ -189,7 +189,7 @@ func main() {
 	errCheck(opts.prepare())
 
 	if len(domains) == 0 {
-		log.Println("No domains given.")
+		log.Println("No domain or direct url given.")
 		return
 	}
 

docs/csaf_checker.md

@@ -26,6 +26,11 @@ Help Options:
   -h, --help                     Show this help message
 ```
 
+Will check all given _domains_, by trying each as a CSAF provider.
+
+If a _domain_ starts with `https://` it is instead considered a direct URL to the `provider-metadata.json` and checking procedes from there.
+
+
 Usage example:
 ` ./csaf_checker example.com -f html --rate=5.3 -H apikey:SECRET -o check-results.html`
 

docs/csaf_downloader.md

@@ -1,5 +1,5 @@
 ## csaf_downloader
-A tool to download CSAF content from a specific domain/provider.
+A tool to download CSAF documents from CSAF providers.
 
 ### Usage
 
@@ -20,3 +20,7 @@ Application Options:
 Help Options:
   -h, --help                   Show this help message
 ```
+
+Will download all CSAF documents for the given _domains_, by trying each as a CSAF provider.
+
+If a _domain_ starts with `https://` it is instead considered a direct URL to the `provider-metadata.json` and downloading procedes from there.