minor updates to aggreate function docs

assets/styles/layouts/_layout-article.scss

@@ -695,6 +695,14 @@
       font-size: .8rem;
     }
   }
+
+  //////////////////////////////// Miscellaneous ///////////////////////////////
+
+  .required {
+    color:#FF8564;
+    font-weight:700;
+    font-style: italic;
+  }
 }
 
 

content/v2.0/reference/flux/functions/built-in/transformations/aggregates/covariance.md

@@ -22,14 +22,10 @@ covariance(columns: ["column_x", "column_y"], pearsonr: false, valueDst: "_value
 ## Parameters
 
 ### columns
-A list of columns on which to operate.
+A list of **two columns** on which to operate. <span class="required">Required</span>
 
 _**Data type:** Array of strings_
 
-{{% note %}}
-Exactly two columns must be provided to the `columns` property.
-{{% /note %}}
-
 ### pearsonr
 Indicates whether the result should be normalized to be the Pearson R coefficient.
 

content/v2.0/reference/flux/functions/built-in/transformations/aggregates/derivative.md

@@ -41,7 +41,7 @@ When set to `true`, if a value is less than the previous value, it is assumed th
 _**Data type:** Boolean_
 
 ### column
-The column on which to compute the derivative.
+The column to use to compute the derivative.
 Defaults to `"_value"`.
 
 _**Data type:** String_

content/v2.0/reference/flux/functions/built-in/transformations/aggregates/difference.md

@@ -29,7 +29,7 @@ When set to `true`, if a value is less than the previous value, it is assumed th
 _**Data type:** Boolean_
 
 ### column
-The column on which to compute the difference.
+The column to use to compute the difference.
 Defaults to `"_value"`.
 
 _**Data type:** String_

content/v2.0/reference/flux/functions/built-in/transformations/aggregates/mean.md

@@ -22,7 +22,7 @@ mean(column: "_value")
 ## Parameters
 
 ### column
-The column on which to compute the mean.
+The column to use to compute the mean.
 Defaults to `"_value"`.
 
 _**Data type:** String_

content/v2.0/reference/flux/functions/built-in/transformations/aggregates/quantile.md

@@ -36,7 +36,7 @@ value that represents the specified quantile.
 ## Parameters
 
 ### column
-The column on which to compute the quantile.
+The column to use to compute the quantile.
 Defaults to `"_value"`.
 
 _**Data type:** String_

content/v2.0/reference/flux/functions/built-in/transformations/aggregates/spread.md

@@ -21,15 +21,15 @@ _**Function type:** Aggregate_
 _**Output data type:** Integer or Float (inherited from input column type)_
 
 ```js
-spread(columns: ["_value"])
+spread(column: "_value")
 ```
 
 ## Parameters
 
-### columns
-Specifies a list of columns on which to operate. Defaults to `["_value"]`.
+### column
+The column on which to operate. Defaults to `"_value"`.
 
-_**Data type:** Array of strings_
+_**Data type:** String_
 
 ## Examples
 ```js

content/v2.0/reference/flux/functions/built-in/transformations/join.md

@@ -46,7 +46,7 @@ The resulting group keys for all tables will be: `[_time, _field_d1, _field_d2]`
 ## Parameters
 
 ### tables
-The map of streams to be joined. <span style="color:#FF8564; font-weight:700;">Required</span>.
+The map of streams to be joined. <span class="required">Required</span>
 
 _**Data type:** Object_
 
@@ -55,7 +55,7 @@ _**Data type:** Object_
 {{% /note %}}
 
 ### on
-The list of columns on which to join. <span style="color:#FF8564; font-weight:700;">Required</span>.
+The list of columns on which to join. <span class="required">Required</span>
 
 _**Data type:** Array of strings_