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doc: fix some func.yaml fields (#1069) 

* doc: fix some func.yaml fields

Addresses recent changes in func.yaml processing. Not all fields
for the file are documented. I'm not sure if they all should be.

Signed-off-by: Lance Ball <lball@redhat.com>

* fixup whitespace

Signed-off-by: Lance Ball <lball@redhat.com>
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docs/reference/func_yaml.md
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@ -3,30 +3,46 @@
The `func.yaml` file contains configuration information for your function
project. Generally, these values are used when you execute a `func` CLI
command. For example, when `func build` is run, the CLI uses the value for
the `builder` field. In many cases, these values may be overridden by
the `builder` field. In some cases, these values may be overridden by
command line flags or environment variables. For more information about
overriding these values, consult the [Commands](command.md) document.
Many of the fields are generated for you when you create, build and deploy
your function. However there are a few that you may use to tweak things
your function. Generally, function developers do not need to manually edit
this file. However there are a few that you may use to tweak things
such as the function name, and the image name.
## Fields
The following fields are used in `func.yaml`.
### `builder`
### `builderImages`
Specifies the buildpack builder image to use when building the function.
In most cases, this value should not be changed.
Defines the builder images to use by builder implementations in lieu of the defaults.
They key is the builder's short name. For example:
### `builders`
```
builderImages:
pack: example.com/user/my-pack-node-builder
s2i: example.com/user/my-s2i-node-builder
```
Some function runtimes may be built in multiple ways. For example, a Quarkus
function may be built for the JVM, or as a native binary. The `builders`
field will contain all of the available builders for a given runtime. Although
it's typically unnecessary to modify the `builder` field, using values from
`builders` is OK.
### `build`
Specifies how to build the fuction. Possible values are "local" to build on your local
computer, or "git" to build on the cluster by pulling function source code from a git
repository.
### `git`
If using a `git` build strategy, this field is used to specify the git URL as well
as an optional context directory. For example:
```
git:
url: github.com/boson-project/example
contextDir: subdirectory
```
### `buildEnvs`
This field allows you to set environment variables available to the builder/buildpack that builds the function. This environment variable is NOT set at runtime, use [envs](#envs) instead