Fix env var name in dataconnect:execute help text.

CHANGELOG.md

@@ -1,3 +1,4 @@
 - Fixed an issue in `apps:create` where App Store ID was always prompted for even when unnecessary.
 - Add `functions:lifecycle:list` and `functions:lifecycle:run` commands to view and run
   lifecycle hooks in isolation.
+- Fixed `dataconnect:execute` command help text. The right env var should be FIREBASE_DATA_CONNECT_EMULATOR_HOST, with an underscore between DATA and CONNECT.

src/commands/dataconnect-execute.ts

@@ -24,7 +24,7 @@
 
 export const command = new Command("dataconnect:execute [file] [operationName]")
   .description(
-    "execute a SQL Connect query or mutation. If FIREBASE_DATACONNECT_EMULATOR_HOST is set (such as during 'firebase emulator:exec', executes against the emulator instead.",
+    "execute a SQL Connect query or mutation. If FIREBASE_DATA_CONNECT_EMULATOR_HOST is set (such as during 'firebase emulator:exec', executes against the emulator instead.",
   )
   .option(
     "--service <serviceId>",
@@ -256,7 +256,7 @@
     },
   );
 
 function parseJsonObject(json: string, subject: string): Record<string, any> {
   let obj: unknown;
   try {
     obj = JSON.parse(json || "{}") as unknown;
@@ -268,7 +268,7 @@
   return obj;
 }
 
 async function literalOrFile(arg: any, subject: string): Promise<string> {
   let str = arg as string | undefined;
   if (!str) {
     return "";