Update weather.markdown

Condition mapping "Partly cloudy" is wrong. The correct one is "Partlycloudy".

source/_integrations/weather.markdown

@@ -35,7 +35,7 @@ The `weather` {% term entity %} can provide the conditions listed below as its s
 - **Hail**: Hailstones are falling.
 - **Lightning**: Lightning/thunderstorms are occurring.
 - **Lightning-rainy**: Lightning/thunderstorm is occurring along with rain.
-- **Partly cloudy**: The sky is partially covered with clouds.
+- **Partlycloudy**: The sky is partially covered with clouds.
 - **Pouring**: It is raining heavily.
 - **Rainy**: It is raining.
 - **Snowy**: It is snowing.