concat example does not work with an array of Observables

Documentation Related To Component:

concat static operator in src/internal/observable/concat.ts

Please check those that apply

• typo
• documentation doesn't exist
• documentation needs clarification
• error(s) in example
• needs example

Description Of The Issue

The exemple Concatenate an array of 3 Observables in the concat documentation page at https://rxjs.dev/api/index/function/concat does not output the expected result.

Expected result

// results in the following:
// (Prints to console sequentially)
// -1000ms-> 0 -1000ms-> 1 -1000ms-> ... 9
// -2000ms-> 0 -2000ms-> 1 -2000ms-> ... 5
// -500ms-> 0 -500ms-> 1 -500ms-> ... 9

Current result in Stackblitz

// Observable {_isScalar: false, source: {…}, operator: {…}}
// Observable {_isScalar: false, source: {…}, operator: {…}}
// Observable {_isScalar: false, source: {…}, operator: {…}}

Additional information

Passing the array with the rest operator instead of the array itself output the expected result.

const result = concat([timer1, timer2, timer3]); // note that array is passed // does not work
const result = concat(...[timer1, timer2, timer3]); // note that array is passed // works

Open the concat documentation page at https://rxjs.dev/api/index/function/concat and inspect the example titled "Concatenate an array of 3 Observables"; the issue also identifies src/internal/observable/concat.ts as the component. Verify the example in Stackblitz and update the documented usage so it produces the three sequential timer outputs rather than Observable objects.