doc: fix typo in example
Closes
@@ -698,7 +698,7 @@ Instantiate the rule and macro:
```python
# myproject/BUILD
-load("//myproject:defx.bzl", "my_custom_bazel_rule")
+load("//myproject:defs.bzl", "my_custom_bazel_rule")
load("//myproject:defs.bzl", "my_custom_bazel_macro")
my_custom_bazel_rule(
@@ -795,7 +795,7 @@ def my_boolean_macro(boolval):
print("TRUE" if boolval else "FALSE")
$ cat myproject/BUILD
-load("//myproject:defx.bzl", "my_boolean_macro")
+load("//myproject:defs.bzl", "my_boolean_macro")
my_boolean_macro(
boolval = select({
"//tools/target_cpu:x86": True,
