Fix minor README style issues

- Hyphenate "Debian-based" (compound adjective)
- Standardize "endpoint" spelling (was inconsistent)
- Remove extra space in Requirements heading

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: oschwald

README.md

@@ -56,7 +56,7 @@ enabled.
 
 If you will be making web service requests, you must have the PHP
 [cURL extension](https://php.net/manual/en/book.curl.php)
-installed to use this archive. For Debian based distributions, this can
+installed to use this archive. For Debian-based distributions, this can
 typically be found in the `php-curl` package. For other operating
 systems, please consult the relevant documentation. After installing the
 extension you may need to restart your web server.
@@ -388,17 +388,17 @@ following:
 
 ### What data is returned? ###
 
-While many of the end points return the same basic records, the attributes
-which can be populated vary between end points. In addition, while an end
-point may offer a particular piece of data, MaxMind does not always have every
-piece of data for any given IP address.
+While many of the endpoints return the same basic records, the attributes
+which can be populated vary between endpoints. In addition, while an
+endpoint may offer a particular piece of data, MaxMind does not always have
+every piece of data for any given IP address.
 
-Because of these factors, it is possible for any end point to return a record
+Because of these factors, it is possible for any endpoint to return a record
 where some or all of the attributes are unpopulated.
 
 See the
 [GeoIP2 web service docs](https://dev.maxmind.com/geoip/docs/web-services?lang=en)
-for details on what data each end point may return.
+for details on what data each endpoint may return.
 
 The only piece of data which is always returned is the `ipAddress`
 attribute in the `GeoIp2\Record\Traits` record.
@@ -445,7 +445,7 @@ If you are having an issue with a MaxMind service that is not specific
 to the client API, please see
 [our support page](https://www.maxmind.com/en/support).
 
-## Requirements  ##
+## Requirements ##
 
 This library requires PHP 8.1 or greater.