Improve fibonacci code in Getting Started page

[MitchellGale]

The Fibonacci demo on the getting started page does not account for overflows. This fix improves it by throwing an error upon overflow (fib 94 or above for uint64).

Old:

What Fibonacci number would you like to know: 
1
Fibonacci(1) = 1
What Fibonacci number would you like to know: 
93
Fibonacci(93) = 12200160415121876738
What Fibonacci number would you like to know: 
94
Fibonacci(94) = 1293530146158671551
What Fibonacci number would you like to know: 
95
Fibonacci(95) = 13493690561280548289
What Fibonacci number would you like to know: 
100
Fibonacci(100) = 3736710778780434371

New:

What Fibonacci number would you like to know: 
1
Fibonacci(1) = 1
What Fibonacci number would you like to know: 
93
Fibonacci(93) = 12200160415121876738
What Fibonacci number would you like to know: 
94
Fibonacci(94): unsigned integer overflow
What Fibonacci number would you like to know: 
95
Fibonacci(95): unsigned integer overflow
What Fibonacci number would you like to know: 
100
Fibonacci(100): unsigned integer overflow

[pellared]

Also please check https://github.com/open-telemetry/opentelemetry.io/actions/runs/5342310912/jobs/9684106429?pr=2901

EDIT: I guess you should use "tabs" 😬

[MrAlias]

This should not have been merged. The error was intentional. It is addressed in a later section: https://github.com/MitchellGale/opentelemetry.io/blob/806d4094e6a1fcf6ce681643dad0f86b534853e2/content/en/docs/instrumentation/go/getting-started.md#bonus-errors

Having this error is important as it helps instruct users how to handle errors with their traces.

[chalin]

@MrAlias @svrnm et al.: To avoid this from happening again, I'd like to suggest that we add a comment (if only a footnote) to mention that the error is intentional, and will be addressed later. WDYT?

[MrAlias]

@MrAlias @svrnm et al.: To avoid this from happening again, I'd like to suggest that we add a comment (if only a footnote) to mention that the error is intentional, and will be addressed later. WDYT?

SGTM 👍

[svrnm]

@MrAlias @svrnm et al.: To avoid this from happening again, I'd like to suggest that we add a comment (if only a footnote) to mention that the error is intentional, and will be addressed later. WDYT?

yes, let's do that.