Updated supported fedora versions

Pihole now supports Fedora 39 and 40 but in documentation it has 38/39 version as supported OS version which creates confusion.

Signed-off-by: Laxman Singh <[email protected]>

Author: laxman-singh

docs/main/prerequisites.md

@@ -31,7 +31,7 @@ The following operating systems are **officially** supported:
 | Armbian OS   | Any | ARM / x86_64 / riscv64           |
 | Ubuntu       | 20.x / 22.x / 23.x    | ARM / x86_64        |
 | Debian       | 10 / 11 / 12         | ARM / x86_64 / i386 |
-| Fedora       | 38 / 39     | ARM / x86_64        |
+| Fedora       | 39 / 40     | ARM / x86_64        |
 | CentOS Stream | 8 / 9            | x86_64              |
 
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