[gnome-builder] README.md: Add vala-language-server

[Christian Hergert <chergert src gnome org>]

commit b935f58eec7b1f7f5606b3fff67a9703f9d47206
Author: JCWasmx86 <JCWasmx86 t-online de>
Date:   Fri Oct 14 19:32:17 2022 +0200

    README.md: Add vala-language-server
    
    Fix typos and inconsistencies

 README.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/README.md b/README.md
index 486c4b402..7a778471d 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ automatically locates the language server within your build environment and
 runs it there (possibly in a container). If it can find it elsewhere (such
 as on the host) that will be used as a fallback.
 
- * bash-language-server (bash)
+ * bash-language-server (Bash)
  * blueprint (Blueprint)
  * clangd (C, C++, Objective-C, Objective-C++)
  * glsl-language-server (GLSL)
@@ -68,7 +68,8 @@ as on the host) that will be used as a fallback.
  * serve-d (D)
  * python-lsp-server (Python)
  * rust-analyzer (Rust)
- * ts-language-server (Javascript, Tyepscript)
+ * ts-language-server (Javascript, Typescript)
+ * vala-language-server (Vala)
  * zls (Zig)
 
 More are being added all the time and do not require writing code if you'd