Update src/content/docs/Developers/Stone/index.mdx

Grammatical fix

Author: NomadicCore

src/content/docs/Developers/Stone/index.mdx

@@ -14,7 +14,7 @@ Each *stone* is composed of a Prelude (the global header) and zero or more paylo
 No limit is set for the length of a *stone*, but it will always be at least 32 bytes long, that is the size of
 the Prelude.
 
-To completely encode or decode a given *stone*, The Stone version must be taken into account,
+To completely encode or decode a given *stone*, the Stone version must be taken into account,
 as different versions may support different contents.
 The version is stored in the Prelude, as explained in the pages to come.
 For now, it is sufficient to remember that each *stone* targets exactly one version.