x-forwarded-prefix is a boolean annotation, but documented as string

[denisw]

The documentation for the x-forwarded-prefix says:

To add the non-standard X-Forwarded-Prefix header to the upstream request with a string value, the following annotation can be used:

However, according to the code, x-forwarded-prefix is parsed as a boolean value that expects a "true". It seems like the docs need updating.

# What is documented:
nginx.ingress.kubernetes.io/x-forwarded-prefix: "/path"

# The reality:
nginx.ingress.kubernetes.io/x-forwarded-prefix: "true"

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[aledbf]

Closing. Fixed in #3786