Fix typo (copied from upstream) in java.bzl (#286)

Author: virusdave

rules/external/third_party/bazel/tools/build_defs/repo/java.bzl

@@ -26,7 +26,7 @@ These import rules must have the following attributes:
 - "runtime_deps"
 - "exports"
 
-the code here is solely based on `jave_import_external` from bazelbuild/bazel repository and is proposed to be upstreamed back.
+the code here is solely based on `java_import_external` from bazelbuild/bazel repository and is proposed to be upstreamed back.
 
 the following macros are defined below that utilize jvm_import_external: