regulators: Fix JSON documentation error

Remove the non-existent "detect_phase_fault" action from the JSON
configuration file documentation.

This action existed in early versions of the phase fault detection
design, but it no longer exists.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I7e1b76bbd690cdf04a1856360395ec111171e6d3
diff --git a/phosphor-regulators/docs/config_file/action.md b/phosphor-regulators/docs/config_file/action.md
index d32332f..1b827eb 100644
--- a/phosphor-regulators/docs/config_file/action.md
+++ b/phosphor-regulators/docs/config_file/action.md
@@ -20,7 +20,6 @@
 | and | see [notes](#notes) | array of actions | Action type [and](and.md). |
 | compare_presence | see [notes](#notes) | [compare_presence](compare_presence.md) | Action type [compare_presence](compare_presence.md). |
 | compare_vpd | see [notes](#notes) | [compare_vpd](compare_vpd.md) | Action type [compare_vpd](compare_vpd.md). |
-| detect_phase_fault | see [notes](#notes) | [detect_phase_fault](#detect_phase_fault) | See [detect_phase_fault](#detect_phase_fault). |
 | i2c_capture_bytes | see [notes](#notes) | [i2c_capture_bytes](i2c_capture_bytes.md) | Action type [i2c_capture_bytes](i2c_capture_bytes.md). |
 | i2c_compare_bit | see [notes](#notes) | [i2c_compare_bit](i2c_compare_bit.md) | Action type [i2c_compare_bit](i2c_compare_bit.md). |
 | i2c_compare_byte | see [notes](#notes) | [i2c_compare_byte](i2c_compare_byte.md) | Action type [i2c_compare_byte](i2c_compare_byte.md). |