Merge pull request #27 from vengatlnx/patch-1

Minor: Fix targets.json path

Author: iriark01

docs/advanced/mbed_targets.md

@@ -1,6 +1,6 @@
 # Adding and configuring mbed targets
 
-mbed uses JSON as a description language for its build targets. The JSON description of mbed targets can be found in `tools/targets.json`. To better understand how a target is defined, we'll use this example (taken from `targets.json`):
+mbed uses JSON as a description language for its build targets. The JSON description of mbed targets can be found in `targets/targets.json`. To better understand how a target is defined, we'll use this example (taken from `targets.json`):
 
 ```
  "TEENSY3_1": {