[docs] Use standard environment variable for Fuchsia root path.

This makes it easier to copy/paste directly from the doc.

Change-Id: Ic386c4a100e0eac0787ac8e9e69a3f24e66c6ca4
diff --git a/docs/development/workflows/workflow_tips_and_faq.md b/docs/development/workflows/workflow_tips_and_faq.md
index f3d52c7..f115c35 100644
--- a/docs/development/workflows/workflow_tips_and_faq.md
+++ b/docs/development/workflows/workflow_tips_and_faq.md
@@ -20,7 +20,7 @@
 
 ## Enabling fuchsia-specific git commands
 
-Add `$FUCHSIA_REPO/scripts/git` to your PATH to be able to use fuchsia-specific git
+Add `$FUCHSIA_DIR/scripts/git` to your PATH to be able to use fuchsia-specific git
 commands such as `git fuchsia-review [<commit ref>]`, which opens the current
 or given commit in gerrit.