Refactor NFP mark sample IDF and IDD changes

The NFP mentions proposals for new keys for the
GroundHeatExchanger:System. This would result in new lines in IDF and
IDD sections. Sample IDF and IDD are presented with proposed changes.
It is helpful for the reader to quickly be able to distinguish the
new lines.

The code blocks in markdown do not allow for highlighting (e.g. bold,
underline, etc.). Additionally, html font highlighting did not appear
to render in the .md file on github. The changed lines were placed
below, and were intended to be highlighted in red (rendering md in atom
offline looked fine), but were not. Therefore, the proposed changed
lines now begin with a ">" to show distinction.

design/FY2021/NFP-Fast_gFunc_Calc_cpgfunction.md

@@ -173,7 +173,8 @@ object, the “g-function calculation model name”, with values of:
 - UBHWTcalc for the new calculation method that utilizes uniform borehole wall
 temperature boundary conditions.
 
-Sample IDF and IDD follow with changes marked in red:
+Sample IDF and IDD follow, new lines are marked with ">" at the beginning of 
+the line:
 
 ```
 !!! IDF example using GHE:Vertical:Array input !!!
@@ -188,10 +189,10 @@ GroundHeatExchanger:System,
   2.5,                     !- Ground Thermal Conductivity {W/m-K}
   2.5E+06,                 !- Ground Thermal Heat Capacity {J/m3-K}
   ,                        !- GHE:Vertical:ResponseFactors Object Name
-  UHFcalc,                 !- g-function Calculation Model Name
+  >UHFcalc,                 !- g-function Calculation Model Name
   GHE-Array;               !- GHE:Vertical:Array Object Name
 ```
-<span style="color:red">UHFcalc, !- g-function Calculation Model Name</span>
+
 
 ```
 !!! IDF example using GHE:Vertical:Single input !!!
@@ -206,21 +207,21 @@ GroundHeatExchanger:System,
     2.5,                     !- Ground Thermal Conductivity {W/m-K}
     2.5E+06,                 !- Ground Thermal Heat Capacity {J/m3-K}
     ,                        !- GHE:Vertical:ResponseFactors Object Name
-    UHFcalc,                 !- g-function Calculation Model Name
+    >UHFcalc,                 !- g-function Calculation Model Name
     ,                        !- GHE:Vertical:Array Object Name
     BH1,                     !- GHE:Vertical:Single Object Name 1
     BH2;                     !- GHE:Vertical:Single Object Name 2
 ```
-<span style="color:red">UHFcalc, !- g-function Calculation Model Name</span>
+
 
 ```
 !!! IDD Modifications !!!
 
 GroundHeatExchanger:System,
     \memo Models vertical ground heat exchangers systems using the response factor approach
     \memo developed by Eskilson. Response factors are calculated using a finite line source
-    \memo model assuming uniform heat flux at the borehole wall if UHFcalc is specified,
-    \memo or uniform borehole wall temperature if UBHWTcalc is specified.
+    >\memo model assuming uniform heat flux at the borehole wall if UHFcalc is specified,
+    >\memo or uniform borehole wall temperature if UBHWTcalc is specified.
     \extensible:1
     \min-fields 9
     A1,   \field Name
@@ -230,7 +231,7 @@ GroundHeatExchanger:System,
     A6, \field GHE:Vertical:ResponseFactors Object Name
         \type object-list
         \object-list GroundHeatExchangerVerticalResponseFactorNames
-    A7, \field g-function Calculation Model Name
+    >A7, \field g-function Calculation Model Name
         \type choice
         \key UHFcalc
         \key UBHWTcalc
@@ -239,16 +240,6 @@ GroundHeatExchanger:System,
         \object-list GroundHeatExchangerVerticalArrayNames
     ...
 ```
-<span style="color:red">\memo model assuming uniform heat flux at the borehole
-wall if UHFcalc is specified,</span>
-
-<span style="color:red">\memo or uniform borehole wall temperature if UBHWTcalc
-is specified.</span>
-
-<span style="color:red">A7, \field g-function Calculation Model Name
-        \type choice
-        \key UHFcalc
-        \key UBHWTcalc</span>
 
 ## Engineering Reference Documentation