fix(doc): simplify example

Author: João Guerreiro

README.md

@@ -37,11 +37,10 @@ poetry add pygitguardian
 
 Check [examples/](examples/) for an example usages of the API.
 
-### Scanning a piece of text
+### Scanning text content
 
 ```py
 API_KEY = os.getenv("GG_API_KEY")
-FILENAME = ".env"
 DOCUMENT = """
     import urllib.request
     url = 'http://jen_barber:[email protected]/isreal.json'
@@ -58,7 +57,7 @@ if status != codes[r"\o/"]:  # this is 200 but cooler
     print("Invalid API Key")
 
 try:
-    scan_result = client.content_scan(filename=FILENAME, document=DOCUMENT)
+    scan_result = client.content_scan(DOCUMENT)
 except Exception as exc:
     # Handle exceptions such as schema validation
     traceback.print_exc(2, file=sys.stderr)