Sync the set of RoundingMode

GetUnsignedRoundingMode now includes additional RoundingModes
expand, halfCeil, halfFloor, halfTrunc and halfEven.
Sync spec text in RoundNumberToIncrement, ToTemporalRoundingMode,
NegateTemporalRoundingMode to match it.

Author: FrankYFTang

spec/abstractops.html

@@ -106,7 +106,7 @@ <h1>ToTemporalRoundingMode ( _normalizedOptions_, _fallback_ )</h1>
       </p>
     </emu-note>
     <emu-alg>
-      1. Return ? GetOption(_normalizedOptions_, *"roundingMode"*, *"string"*, « *"ceil"*, *"floor"*, *"trunc"*, *"halfExpand"* », _fallback_).
+      1. Return ? GetOption(_normalizedOptions_, *"roundingMode"*, *"string"*, « *"ceil"*, *"floor"*, *"expand"*, *"trunc"*, *"halfCeil"*, *"halfFloor"*, *"halfExpand"*, *"halfTrunc"*, *"halfEven"* », _fallback_).
     </emu-alg>
   </emu-clause>
 
@@ -123,6 +123,8 @@ <h1>NegateTemporalRoundingMode ( _roundingMode_ )</h1>
     <emu-alg>
       1. If _roundingMode_ is *"ceil"*, return *"floor"*.
       1. If _roundingMode_ is *"floor"*, return *"ceil"*.
+      1. If _roundingMode_ is *"halfCeil"*, return *"halfFloor"*.
+      1. If _roundingMode_ is *"halfFloor"*, return *"halfCeil"*.
       1. Return _roundingMode_.
     </emu-alg>
   </emu-clause>
@@ -748,7 +750,7 @@ <h1>
       RoundNumberToIncrement (
         _x_: a mathematical value,
         _increment_: an integer,
-        _roundingMode_: *"ceil"*, *"floor"*, *"trunc"*, or *"halfExpand"*,
+        _roundingMode_: *"ceil"*, *"floor"*, *"expand"*, *"trunc"*, *"halfCeil"*, *"halfFloor"*, *"halfExpand"*, *"halfTrunc"*, or *"halfEven"*,
       ): an integer
     </h1>
     <dl class="header">

spec/zoneddatetime.html

@@ -1167,7 +1167,7 @@ <h1>
           _showOffset_: one of *"auto"* or *"never"*,
           optional _increment_: an integer,
           optional _unit_: one of *"minute"*, *"second"*, *"millisecond"*, *"microsecond"*, or *"nanosecond"*,
-          optional _roundingMode_: one of *"ceil"*, *"floor"*, *"trunc"*, or *"halfExpand"*,
+          optional _roundingMode_: one of *"ceil"*, *"floor"*, *"expand"*, *"trunc"*, *"halfCeil"*, *"halfFloor"*, *"halfExpand"*, *"halfTrunc"*, or *"halfEven"*,
         ): either a normal completion containing a String or an abrupt completion
       </h1>
       <dl class="header">