Update README.md

Fix typos.

README.md

@@ -10,11 +10,11 @@ for `lxml`, see the [official Documentation](https://lxml.de/).
 ## Running the script
 
 Run `python3 main.py -h` for instructions. 
-* There are two output supported formats (MARC and MARCXML).
+* There are two supported output formats (MARC and MARCXML).
 * There are two sources for authority data supported, namely the [iDAI.gazetteer](https://gazetteer.dainst.org) and the 
 [Libray of Congress](http://id.loc.gov/index.html).
-* There are three ways to specify the date marking the earliest updates you are interested in:
-** Specify a date in ISO format (YYYY-MM-DD).
-** Specify a day offset from the current date.
-** Continue from the last day, the script was executed (after each run, this date is stored in a log file in the output
-director).
+* There are three ways to specify the date marking the oldest updates you are interested in:
+  1. Specify a date in ISO format (YYYY-MM-DD).
+  2. Specify a day(s) offset from your current date.
+  3. Continue from the last day the script was executed (after each run, this date is stored in a log file in the output
+directory).