Update phi4_multimodal.md

[Tanuj-rai]

What does this PR do?

This PR updates the Phi-4 Multimodal card documentation as described in #36979, in an attempt to standardize all model-cards.

Fixes #36979

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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  Pull Request section?
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• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@stevhliu

[stevhliu]

Thanks for your contribution!

[stevhliu]

Lets remove since the command line doesn't accept image or speech inputs

[stevhliu]

Add:

- The example below demonstrates inference with an audio and text input.

   ```py
   add the audio processing code example here
 

[stevhliu]

Hey @Cyrilvallez, when I try to run the code in the Usage tips, I get the following error. Would you mind taking a look please? 😄

[/usr/local/lib/python3.11/dist-packages/jinja2/environment.py](https://localhost:8080/#) in handle_exception(self, source)
    940         from .debug import rewrite_traceback_stack
    941 
--> 942         raise rewrite_traceback_stack(source=source)
    943 
    944     def join_path(self, template: str, parent: str) -> str:

<template> in top-level template code()

TypeError: can only concatenate str (not "list") to str

[stevhliu]

@Cyrilvallez, this code example also returns the following error:

AttributeError: 'LoraModel' object has no attribute 'prepare_inputs_for_generation'

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
[/usr/local/lib/python3.11/dist-packages/torch/nn/modules/module.py](https://localhost:8080/#) in __getattr__(self, name)
   1926             if name in modules:
   1927                 return modules[name]
-> 1928         raise AttributeError(
   1929             f"'{type(self).__name__}' object has no attribute '{name}'"
   1930         )

AttributeError: 'Phi4MMModel' object has no attribute 'prepare_inputs_for_generation'