Update names to match docs (#54)

## Purpose
<!-- Describe the intention of the changes being proposed. What problem
does it solve or functionality does it add? -->
Update names used in manifest to match names used in the docs. The new
names are approved fictitious company names and generic product names.

## Does this introduce a breaking change?
<!-- Mark one with an "x". -->
```
[ ] Yes
[x] No
```

## Pull Request Type
What kind of change does this Pull Request introduce?

<!-- Please check the one that applies to this PR using "x". -->
```
[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:
```

## Other Information
<!-- Add any other helpful information that may be needed here. -->

samples/http-grpc-callout/manifest.yml

@@ -106,15 +106,15 @@ data:
               [
                   {
                       "Line":"Line1",
-                      "ProductId":"Donette",
+                      "ProductId":"Bagel",
                       "Customer":"Contoso",
-                      "Manufacturer": "Robotech"
+                      "Manufacturer": "Fabrikam"
                   },
                   {
                       "Line":"Line2",
-                      "ProductId":"Twinkies",
+                      "ProductId":"Donut",
                       "Customer":"Contoso",
-                      "Manufacturer": "ZenithTech"
+                      "Manufacturer": "Northwind"
                   }
               ]
           - path: /operatorData