THRIFT-3148 Markdown links to coding_standards are dead

This closes #491
diff --git a/lib/java/coding_standards.md b/lib/java/coding_standards.md
index d4751af..fa0390b 100644
--- a/lib/java/coding_standards.md
+++ b/lib/java/coding_standards.md
@@ -1 +1 @@
-Please follow [General Coding Standards](/coding_standards)
+Please follow [General Coding Standards](/doc/coding_standards.md)