Fix typo in spec (#182)

spec.emu

@@ -51,7 +51,7 @@ location: https://github.com/tc39/proposal-decimal/
       <li>MV(*-0*<sub>𝔻</sub>) = 0</li>
       <li>MV(_v_) = _v_ (provided _v_ is neither *+0*<sub>𝔻</sub> nor *-0*<sub>𝔻</sub>)</li>
     </ul>
-    <p>Decimal128 values defined in this section are ECMAScript analogues of <emu-xref href="#sec-bibliography">IEEE 754-2019 Decimal128 values</emu-xref>. It is important to note that the full spectrum of values defined by IEEE 754-2019 Decimal128 are not available here, namely non-canonical Decimal128 values, which can be underdtood as values containing trailing zeroes. Also, this specification simplifies IEEE 754-2019 Decimal128 in a further way: there is only one Decimal128 value, NaN<sub>𝔻</sub>, representing all possible IEEE 754-2019 Decimal128 NaN values.</p>
+    <p>Decimal128 values defined in this section are ECMAScript analogues of <emu-xref href="#sec-bibliography">IEEE 754-2019 Decimal128 values</emu-xref>. It is important to note that the full spectrum of values defined by IEEE 754-2019 Decimal128 are not available here, namely non-canonical Decimal128 values, which can be understood as values containing trailing zeroes. Also, this specification simplifies IEEE 754-2019 Decimal128 in a further way: there is only one Decimal128 value, NaN<sub>𝔻</sub>, representing all possible IEEE 754-2019 Decimal128 NaN values.</p>
     <p>A <dfn id="dfn-decimal128-rounding-mode">Decimal128 rounding mode</dfn> is one of the String values *"ceil"*, *"floor"*, *"trunc"*, *"halfExpand"*, and *"halfEven"*. The <dfn id="dfn-decimal128-default-rounding-mode">default rounding mode</dfn> is the String value *"halfEven"*.</p>
     <emu-table id="table-decimal128-rounding-modes">
       <emu-caption>Rounding modes in Decimal128 compared to IEEE 754-2019 rounding modes</emu-caption>