fix: tweak JSON parsing error message (#203)

Signed-off-by: Phil Adams <[email protected]>

Author: padamstx

src/main/java/com/ibm/cloud/sdk/core/service/BaseService.java

@@ -521,7 +521,7 @@ protected <T> T processServiceCall(final ResponseConverter<T> converter, final R
       try {
         return converter.convert(response);
       } catch (Throwable t) {
-        throw new InvalidServiceResponseException(response, "Error processing the http response", t);
+        throw new InvalidServiceResponseException(response, "Error processing the HTTP response", t);
       }
     }