docs(golangci-lint): fix the target name (#144)

This is what the example setup uses, and it's what I had to use to
get this to work in our workspace.
https://github.com/aspect-build/rules_lint/blob/ebe8678587abb1f9104abbfc6ca2ee1a8579b4aa/example/tools/lint.bzl#L59-L62

Author: srabraham

docs/golangci-lint.md

@@ -4,7 +4,7 @@
 load("@aspect_rules_lint//lint:golangci-lint.bzl", "golangci_lint_aspect")
 
 golangci_lint = golangci_lint_aspect(
-    binary = "@@//tools:golangci-lint",
+    binary = "@@//tools:golangci_lint",
     config = "@@//:.golangci.yaml",
 )
 ```