Fix prometheus typo. (#3999)

Signed-off-by: Michael Payne <michael@sooper.org>

Mirrored from https://github.com/envoyproxy/envoy @ f0ca7541550baa3dd34dd69c948c2696d5c92e12

bazel/repositories.bzl

@@ -239,7 +239,7 @@ py_proto_library(
     )
 
     native.new_http_archive(
-        name = "promotheus_metrics_model",
+        name = "prometheus_metrics_model",
         strip_prefix = "client_model-" + PROMETHEUS_SHA,
         url = "https://github.com/prometheus/client_model/archive/" + PROMETHEUS_SHA + ".tar.gz",
         build_file_content = """

envoy/service/metrics/v2/BUILD

@@ -10,7 +10,7 @@ api_proto_library_internal(
     deps = [
         "//envoy/api/v2/core:base",
         "//envoy/api/v2/core:grpc_service",
-        "@promotheus_metrics_model//:client_model",
+        "@prometheus_metrics_model//:client_model",
     ],
 )
 
@@ -19,6 +19,6 @@ api_go_grpc_library(
     proto = ":metrics_service",
     deps = [
         "//envoy/api/v2/core:base_go_proto",
-        "@promotheus_metrics_model//:client_model_go_proto",
+        "@prometheus_metrics_model//:client_model_go_proto",
     ],
 )