docs: improve Go documentation (#7820)

* use 1.'s for ordered list

* fix whitespace in ordered list

* use active voice

* capitalize SemVer

* Remove fluff word

* use active voice

* update paragraph, needs further work

* explain how to pin to a specific Go lang version

* change Go version from 1.14.2 -> 1.14.12

* strip patch level from Go version, explain why

docs/usage/golang.md

@@ -9,26 +9,26 @@ Renovate supports upgrading dependencies in `go.mod` files and their accompanyin
 
 ## How It Works
 
-1.  Renovate will search each repository for any `go.mod` files
-2.  Existing dependencies will be extracted from `require` statements
-3.  Renovate will resolve the dependency's source repository and check for semver tags if found. Otherwise commits and `v0.0.0-....` syntax will be used
-4.  If an update was found, Renovate will update `go.mod` to the new value
-5.  Renovate will run `go get` to update the `go.sum` files
-6.  If the user has enabled the option `gomodTidy` in the [`postUpdateOptions`](https://docs.renovatebot.com/configuration-options/#postupdateoptions) array, then Renovate will run `go mod tidy`, which itself can update `go.mod` and `go.sum`
-7.  `go mod vendor` will be run if vendored modules have been detected
-8.  A PR will be created with `go.mod`,`go.sum`, and any updated vendored files updated in the one commit
-9.  If the source repository has either a "changelog" file or uses GitHub releases, then Release Notes for each version will be embedded in the generated PR
+1. Renovate searches in each repository for any `go.mod` files
+1. Renovate extracts existing dependencies from `require` statements
+1. Renovate resolves the dependency's source repository and checks for SemVer tags if found. Otherwise commits and `v0.0.0-....` syntax will be used
+1. If Renovate finds an update, Renovate will update `go.mod` to the new value
+1. Renovate runs `go get` to update the `go.sum` files
+1. If the user has enabled the option `gomodTidy` in the [`postUpdateOptions`](https://docs.renovatebot.com/configuration-options/#postupdateoptions) array, then Renovate runs `go mod tidy`, which itself can update `go.mod` and `go.sum`
+1. `go mod vendor` is run if vendored modules are detected
+1. A PR will be created with `go.mod`,`go.sum`, and any updated vendored files updated in the one commit
+1. If the source repository has either a "changelog" file or uses GitHub releases, then Release Notes for each version will be embedded in the generated PR
 
 ## Enabling Go Modules Updating
 
-Go Modules updating is on by default in Renovate Bot.
+Renovate updates Go Modules by default.
 To install Renovate Bot itself, either enable the [Renovate App](https://github.com/apps/renovate) on GitHub, or check out [Renovate OSS](https://github.com/renovatebot/renovate) for self-hosted.
 
 ## Technical Details
 
 #### Module Tidying
 
-Go Modules tidying is not enabled by default, and so is opt-in via the [`postUpdateOptions`](https://docs.renovatebot.com/configuration-options/#postupdateoptions) config option.
+Go Modules tidying is not enabled by default, and is opt-in via the [`postUpdateOptions`](https://docs.renovatebot.com/configuration-options/#postupdateoptions) config option.
 The reason for this is that a `go mod tidy` command may make changes to `go.mod` and `go.sum` that are completely unrelated to the updated module(s) in the PR, and so may be confusing to some users.
 
 #### Module Vendoring
@@ -38,5 +38,8 @@ Renovate will commit all files changed within the `vendor/` folder.
 
 #### Go binary version
 
-Currently, Renovate will try to keep up with the very latest version of `go`, and it is not configurable.
-It is planned though to support a configurable version of `go` per-repository soon.
+By default, Renovate will keep up with the very latest version of `go`.
+
+You can "pin" the `go` version that Renovate uses.
+Say you want Renovate to use Go version 1.14, you can do this by adding `go 1.14` to your `go.mod` file.
+We do not support pinning Go versions to a specific patch level, so you cannot use `go 1.14.12`, but you can use `go 1.14` in your `go.mod` file.