fix spelling error

Author: aloverro

articles/planetary-computer/render-configuration.md

@@ -87,7 +87,7 @@ Before building the configuration, determine how you want to visualize your data
 | :------------------------ | :----------------------------------------------------------------------- | :------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------- |
 | **Single-Band Data**      | Each pixel has one value.                                                | elevation, temperature, land cover classification, calculated index  | Map these single values to a color range or discrete colors using a **colormap**.                              |
 | **Multi-Band Data**       | Data has multiple bands per pixel.                                       | RGB satellite imagery, multi-spectral data                           | Combine three specific bands to represent the Red, Green, and Blue channels of the output image.               |
-| **Derived Data (Expressions)** | Calculate a new value  from one or more bands/assets.        | Normalized Difference Vegitation Index (NDVI) from Red and NIR bands                                          | Define a mathematical **expression** and visualize the result (single-band with colormap or multi-band directly). |
+| **Derived Data (Expressions)** | Calculate a new value  from one or more bands/assets.        | Normalized Difference vegetation Index (NDVI) from Red and NIR bands                                          | Define a mathematical **expression** and visualize the result (single-band with colormap or multi-band directly). |
 | **Derived Data (Algorithms)** | Calculate a new value across pixels.        | Hillshade shows contours of elevation data                                          | Use a mathematical **algorithm** to transform data into a visualization. |
 | **Data Cubes (GRIB/NetCDF)** | Data stored in GRIB or NetCDF formats with multiple variables and dimensions. | time, pressure levels                                                | Select a specific variable and potentially a slice through other dimensions (like time) for 2D visualization. |