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<https://github.com/The-OpenROAD-Project/OpenLane/pull/1764|#1764 Moving, Renaming and Documenting Config. Variables>
Pull request opened by <https://github.com/kareefardi|kareefardi>
Renamed Variables:

```
CLOCK_TREE_SYNTH -&gt; RUN_CTS
FP_PDN_RAILS_LAYER -&gt; FP_PDN_RAIL_LAYER
FP_PDN_UPPER_LAYER, FP_PDN_LOWER_LAYER -&gt; FP_PDN_HORIZONTAL_LAYER, FP_PDN_VERTICAL_LAYER
```

Removed from default configuration:

```
RCX_CORNER_COUNT
RCX_MAX_RESISTANCE		
RCX_COUPLING_THRESHOLD		
RCX_CC_MODEL	
RCX_CONTEXT_DEPTH
```

Added documentation:

```
FP_PDN_CFG
FP_PDN_HSPACING
FP_PDN_VSPACING
FP_TAPCELL_DIST
DFF_LIB_SYNTH
DIODE_CELL_PIN
DIODE_CELL
STD_CELL_GROUND_PINS
CARRY_SELECT_ADDER_MAP
FULL_ADDER_MAP
STD_CELL_LIBRARY_CDL
LAYERS_RC
VIAS_RC
SYNTH_DEFINES
STA_REPORT_POWER
FP_PDN_ENABLE_GLOBAL_CONNECTIONS
PL_RESIZER_TIE_SEPERATION
QUIT_ON_HOLD_VIOLATIONS
QUIT_ON_SETUP_VIOLATIONS
QUIT_ON_TIMING_VIOLATIONS
```

Moved to pdk configuration:

```
FP_PDN_VOFFSET
FP_PDN_VPITCH
FP_PDN_HOFFSET
FP_PDN_HPITCH
```

- Remove unneeded usage of `PL_TARGET_DENSITY_CELLS`

Addresses <https://github.com/The-OpenROAD-Project/OpenLane/issues/1325|#1325>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>
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<https://github.com/The-OpenROAD-Project/OpenLane/pull/1764|#1764 Missing variables documentation + renames>
Pull request ready for review by <https://github.com/donn|donn>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>

<https://github.com/The-OpenROAD-Project/OpenLane/pull/1764|#1764 Moving, Renaming and Documenting Config. Variables>
Pull request merged by <https://github.com/kareefardi|kareefardi>
<https://github.com/The-OpenROAD-Project/OpenLane|The-OpenROAD-Project/OpenLane>