[Documentation] Adds some notes stating that Speasy isn't a plotting …

…package

@nicolasaunai this is for you ;)

Signed-off-by: Alexis Jeandet <alexis.jeandet@member.fsf.org>

README.rst

@@ -105,6 +105,7 @@ Caveats
 =======
 - installing speasy on both python 3.7 or less and python 3.8 or plus at the same time doesn't work since entries stored
 in cache by python 3.8+ are not readable by python 3.7-.
+- Speasy is not a plotting package, while it provides basic plot features, it is not meant to produce publication ready figures.
 
 Credits
 ========

docs/user/amda/amda.rst

@@ -166,8 +166,9 @@ Then you should get something like this:
    :height: 400px
    :alt: mms2_b_gse plot
 
-Note: Depending on your matplotlib backend and if you are using Jupyter Notebooks or a simple python terminal you may
-need to adapt this example.
+.. note::
+    * Depending on your matplotlib backend and if you are using Jupyter Notebooks or a simple python terminal you may need to adapt this example.
+    * Speasy is not a plotting package, to produce publication ready figures, use something like matplotlib or seaborn directly.
 
 Using timetables to download data
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -214,6 +215,9 @@ Then you should get something like these plots:
    :width: 49%
    :alt: Cloud's B mean histogram
 
+.. note::
+    * Depending on your matplotlib backend and if you are using Jupyter Notebooks or a simple python terminal you may need to adapt this example.
+    * Speasy is not a plotting package, to produce publication ready figures, use something like matplotlib or seaborn directly.
 
 Advanced: AMDA module configuration options
 -------------------------------------------