limine: Fix a small typo error in PROTOCOL.md
This corrects an error which mistakenly says "the an Entry Point request (...)", in the section where the machine state at entry into the kernel is described.
diff --git a/PROTOCOL.md b/PROTOCOL.md
index 77b609ca..8679d973 100644
--- a/PROTOCOL.md
+++ b/PROTOCOL.md
@@ -168,8 +168,8 @@ everything is mapped with `PBMT=PMA`).
### x86-64
`rip` will be the entry point as defined as part of the executable file format,
-unless the an Entry Point feature is requested (see below), in which case,
-the value of `rip` is going to be taken from there.
+unless an Entry Point feature is requested (see below), in which case, the value
+of `rip` is going to be taken from there.
At entry all segment registers are loaded as 64 bit code/data segments, limits
and bases are ignored since this is 64-bit mode.
