Fixup correct param name

Author: 44uk

NisApi.src.html

@@ -2133,7 +2133,7 @@ <h4>Parameter:</h4>
     <table class=NemTableGrid>
         <tr>
             <td>
-                <p class=JSON>blockHeight </p>
+                <p class=JSON>height</p>
             </td>
             <td>
                 <p class=NemNoSpacing>A BlockHeight JSON object as described
@@ -2194,7 +2194,7 @@ <h4>Parameter:</h4>
     <table class=NemTableGrid>
         <tr>
             <td>
-                <p class=JSON>blockHeight </p>
+                <p class=JSON>height</p>
             </td>
             <td>
                 <p class=NemNoSpacing>A BlockHeight JSON object as described