Fix RTD build on memory limits

Closes #30 (closed)

• Documentation: https://moon-coverage.univ-nantes.fr/en/30-rtd-build-failed-due-to-memory-limits/
• Build status:

docs/api/plot.md

@@ -49,34 +49,46 @@
 
 ## Background Maps API
 
-### `CALLISTO`
-```{eval-rst}
-.. autoattribute:: moon_coverage.maps.CALLISTO
-```
-### `EARTH`
+### `IO`
 ```{eval-rst}
-.. autoattribute:: moon_coverage.maps.EARTH
+.. autoattribute:: moon_coverage.maps.IO
 ```
 ### `EUROPA`
 ```{eval-rst}
 .. autoattribute:: moon_coverage.maps.EUROPA
 ```
+### `CALLISTO`
+```{eval-rst}
+.. autoattribute:: moon_coverage.maps.CALLISTO
+```
 ### `GANYMEDE`
 ```{eval-rst}
 .. autoattribute:: moon_coverage.maps.GANYMEDE
 ```
-### `MOON`
+### `JUPITER`
 ```{eval-rst}
-.. autoattribute:: moon_coverage.maps.MOON
+.. autoattribute:: moon_coverage.maps.JUPITER
 ```
-### `IO`
+### `EARTH`
 ```{eval-rst}
-.. autoattribute:: moon_coverage.maps.IO
+.. autoattribute:: moon_coverage.maps.EARTH
+```
+### `MOON`
+```{eval-rst}
+.. autoattribute:: moon_coverage.maps.MOON
 ```
 ### `VENUS`
 ```{eval-rst}
 .. autoattribute:: moon_coverage.maps.VENUS
 ```
+### `MERCURY`
+```{eval-rst}
+.. autoattribute:: moon_coverage.maps.MERCURY
+```
+### `MAPS`
+```{eval-rst}
+.. autoattribute:: moon_coverage.maps.MAPS
+```
 ### `Map`
 ```{eval-rst}
 .. autoclass:: moon_coverage.maps.Map