Change incorrect notation of Weaviate to PG Vector in env.example (#4439)

Change incorrect notation of Weaviate to PG Vector

Author: angelplusultra

server/.env.example

@@ -228,7 +228,7 @@ SIG_SALT='salt' # Please generate random string at least 32 chars long.
 # Enable all below if you are using vector database: LanceDB.
 VECTOR_DB="lancedb"
 
-# Enable all below if you are using vector database: Weaviate.
+# Enable all below if you are using vector database: PG Vector.
 # VECTOR_DB="pgvector"
 # PGVECTOR_CONNECTION_STRING="postgresql://dbuser:dbuserpass@localhost:5432/yourdb"
 # PGVECTOR_TABLE_NAME="anythingllm_vectors" # optional, but can be defined