Splling fix

doc/CDB_ColumnNames.md

@@ -7,7 +7,7 @@ SELECT CDB_ColumnNames('table_name')
 --- Returns a set of rows with column names
 ```
 
-#### Arguements
+#### Arguments
 
 CDB_ColumnNames(table_name)
 

doc/CDB_ColumnType.md

@@ -7,7 +7,7 @@ SELECT CDB_ColumnType('column_name','table_name')
 --- Returns a set of rows with column types
 ```
 
-#### Arguements
+#### Arguments
 
 CDB_ColumnType(column_name, table_name)
 

doc/CDB_HeadsTailsBins.md

@@ -13,7 +13,7 @@ SELECT CDB_HeadsTailsBins(array_agg(numeric_column), 7) FROM table_name
 -- (bin1 is less than or equal to 7824, bin2 is less than or equal to 23492, etc.)
 ```
 
-#### Arguements
+#### Arguments
 
 CDB_HeadsTailsBins(in_array, breaks)
 

doc/CDB_MakeHexagon.md

@@ -13,7 +13,7 @@ Would give you back a single hexagon geometry,
 ![hexagon](http://i.imgur.com/6jeGStb.png)
 
 
-#### Arguements
+#### Arguments
 
 CDB_MakeHexagon(center, radius)
 

doc/CDB_QuantileBins.md

@@ -13,7 +13,7 @@ SELECT CDB_QuantileBins(array_agg(numeric_column), 7) FROM table_name
 -- (bin1 is less than or equal to 80, bin2 is less than or equal to 2281, etc.)
 ```
 
-#### Arguements
+#### Arguments
 
 CDB_QuantileBins(in_array, breaks)
 

doc/CDB_RectangleGrid.md

@@ -36,7 +36,7 @@ Which will look something like this,
 
 ![rect grid](http://i.imgur.com/HuhOJRs.png)
 
-#### Arguements
+#### Arguments
 
 CDB_RectangleGrid(ext, width, height, origin)
 

doc/CDB_TransformToWebmercator.md

@@ -37,7 +37,7 @@ Would give you back a single valid rectangle in webmercator. Since a longitude o
 ![valid geom](http://i.imgur.com/EFdXiqt.png)
 
 
-#### Arguements
+#### Arguments
 
 CDB_TransformToWebmercator(geom)
 

doc/CDB_XYZ_Extent.md

@@ -13,7 +13,7 @@ SELECT CDB_XYZ_Extent(3,2,2)
 --- Returns a WKB polygon in Webmercator (SRID 3857)
 ```
 
-#### Arguements
+#### Arguments
 
 CDB_XYZ_Extent(x,y,z)
 

doc/CDB_XYZ_Resolution.md

@@ -13,7 +13,7 @@ SELECT CDB_XYZ_Resolution(2)
 --- Returns a float, 39135.7587890625
 ```
 
-#### Arguements
+#### Arguments
 
 CDB_XYZ_Resolution(z)