Privacy policy: improve wording in the GDPR and Cookies sections

Replaced one instance of "website" with "websites", and "site" with
"service". Also replaced "when you access the website" with
"when you access an Arch service".

This fixes the first point of this wiki discussion:
https://wiki.archlinux.org/index.php/ArchWiki_talk:Privacy_policy#Rights_under_GDPR

privacy-policy.md

@@ -130,7 +130,7 @@ Cookies and other browser information
 -------------------------------------
 
 Arch's online services automatically capture IP addresses. We use IP addresses to help diagnose
-problems with our servers, to administer our website, and to help ensure the security of your
+problems with our servers, to administer our websites, and to help ensure the security of your
 interaction with our services. Your IP address is used to help identify you and your location, in
 order to provide you data and content from our services as quickly as possible. It is in the
 interests of the Arch community to maximize the efficiency and effectiveness of its services for
@@ -158,8 +158,8 @@ If you do not want your personal information to be stored by cookies, you can co
 browser so that it always rejects these cookies or asks you each time if you accept them or not.
 However, you must understand that the use of cookies may be necessary to provide certain services
 (see 1. above), and choosing to reject cookies will reduce the performance and functionality of the
-site. Your browser documentation includes instructions explaining how to enable, disable or delete
-cookies at the browser level (usually located in the "Help", "Tools" or "Edit" facility).
+service. Your browser documentation includes instructions explaining how to enable, disable or
+delete cookies at the browser level (usually located in the "Help", "Tools" or "Edit" facility).
 
 Public forums reminder
 ----------------------
@@ -191,10 +191,10 @@ collection procedures of linked sites, please contact those sites directly.
 Your rights under GDPR in the EEA
 ---------------------------------
 
-Where the
-[EU General Data Protection Regulation](https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32016R0679&from=EN)
-2016/679 ("GDPR") applies to the processing of your personal data, especially when you access the
-website from a country in the European Economic Area ("EEA"), you have the following rights,
+Where the [EU General Data Protection Regulation](
+https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32016R0679&from=EN)
+2016/679 ("GDPR") applies to the processing of your personal data, especially when you access an
+Arch service from a country in the European Economic Area ("EEA"), you have the following rights,
 subject to some limitations, against Arch:
 
 - The right to access your personal data;