Merge pull request #1000 from nest/units-prefix-fix

Fix units prefix in table

doc/nestml_language/nestml_language_concepts.rst

@@ -87,7 +87,7 @@ Units can have at most one of the following magnitude prefixes:
 +----------+-----------+-----------------+----------+-----------+-----------------+
 | 10^-3    | milli     | m               | 10^3     | kilo      | k               |
 +----------+-----------+-----------------+----------+-----------+-----------------+
-| 10^-6    | micro     | mu              | 10^6     | mega      | M               |
+| 10^-6    | micro     | u               | 10^6     | mega      | M               |
 +----------+-----------+-----------------+----------+-----------+-----------------+
 | 10^-9    | nano      | n               | 10^9     | giga      | G               |
 +----------+-----------+-----------------+----------+-----------+-----------------+