fix some editor mishaps, change preflight field to preflightRules

Signed-off-by: everettraven <[email protected]>

proposals/kapp/001-crd-upgrade-safety/README.md

@@ -93,8 +93,8 @@ As an example, configuring a preflight check could look something like:
 ```yaml
 apiVersion: kapp.k14s.io/v1alpha1
 kind: Config
----
-preflight:
+...
+preflightRules:
   - name: Check
     config:
       paramOne: somevalue
@@ -103,6 +103,7 @@ preflight:
     config:
       otherParamOne:
         value: foo
+...
 ```
 
 Each entry in the `preflight` field contains the `name` of the preflight check and an optional map of configuration values (specified by the `config` field).