update documentation

[lidongjies]

#461
when I use fastify.inject() test api, I found two problems:

1. there is no body param in callback.
2. the typeof res.headers['content-length'] is not string, it is actually a number.

[mcollina]

LGTM

[allevo]

there is no body param in callback.

ok

the typeof res.headers['content-length'] is not string, it is actually a number.

maybe this is a bug. it depends if nodejs code library convert it into number or keep it as string. in the second case, light-my-request should be patched

[delvedor]

LGTM

[delvedor]

maybe this is a bug. it depends if nodejs code library convert it into number or keep it as string. in the second case, light-my-request should be patched

@allevo if you think is a bug open an issue in light-my-request, we'll find out more there :)

[github-actions]

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