docs: Fix casing of "Tree-sitter" (#25427)

This PR fixes the casing of "Tree-sitter" in the docs.

It is "Tree-sitter", not "Tree Sitter" or "Tree-Sitter".

Release Notes:

- N/A

docs/src/languages/java.md

@@ -7,7 +7,7 @@ There are two extensions that provide Java language support for Zed:
 
 Both use:
 
-- Tree Sitter: [tree-sitter/tree-sitter-java](https://github.com/tree-sitter/tree-sitter-java)
+- Tree-sitter: [tree-sitter/tree-sitter-java](https://github.com/tree-sitter/tree-sitter-java)
 - Language Server: [eclipse-jdtls/eclipse.jdt.ls](https://github.com/eclipse-jdtls/eclipse.jdt.ls)
 
 ## Install OpenJDK