website/externaldata: fix rego snippet (#1687)

Dashes in variable names are not allowed. `my-list` would be parsed as `my` minus `list`. Signed-off-by: Stephan Renatus <stephan.renatus@gmail.com>
open-policy-agent · Nov 30, 2021 · c459043 · c459043
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diff --git a/website/docs/externaldata.md b/website/docs/externaldata.md
@@ -96,10 +96,10 @@ External data adds a [custom OPA built-in function](https://www.openpolicyagent.
 e.g.,
 ```rego
   # build a list of keys containing images for batching
-  my-list := [img | img = input.review.object.spec.template.spec.containers[_].image]
+  my_list := [img | img = input.review.object.spec.template.spec.containers[_].image]
 
   # send external data request
-  response := external_data({"provider": "my-provider", "keys": my-list})
+  response := external_data({"provider": "my-provider", "keys": my_list})
 ```
 
 Response example: [[`"my-key"`, `"my-value"`, `""`], [`"another-key"`, `42`, `""`], [`"bad-key"`, `""`, `"error message"`]]

diff --git a/website/versioned_docs/version-v3.7.x/externaldata.md b/website/versioned_docs/version-v3.7.x/externaldata.md
@@ -96,10 +96,10 @@ External data adds a [custom OPA built-in function](https://www.openpolicyagent.
 e.g.,
 ```rego
   # build a list of keys containing images for batching
-  my-list := [img | img = input.review.object.spec.template.spec.containers[_].image]
+  my_list := [img | img = input.review.object.spec.template.spec.containers[_].image]
 
   # send external data request
-  response := external_data({"provider": "my-provider", "keys": my-list})
+  response := external_data({"provider": "my-provider", "keys": my_list})
 ```
 
 Response example: [[`"my-key"`, `"my-value"`, `""`], [`"another-key"`, `42`, `""`], [`"bad-key"`, `""`, `"error message"`]]