Merge pull request #4 from cwingard/docs/ctd-functions

Convert ctd_functions.py docstrings to NumPy format, add CTD API page

Author: cwingard

docs/api/ctd_functions.md

@@ -0,0 +1,8 @@
+# CTD
+
+Functions for the OOI CTD instrument family: SBE 16Plus, SBE 37IM, SBE 52MP,
+and glider-mounted CTDs (CTDBP, CTDMO, CTDPF, CTDGV).
+
+## Core functions
+
+::: ion_functions.data.ctd_functions

docs/index.md

@@ -12,6 +12,7 @@ oxygen, CO2, fluorometry, pH, pressure, meteorology, and more.
 | Module | Instruments | Data products |
 |--------|-------------|---------------|
 | [Hydrophone](api/hyd_functions.md) | HYDBB, HYDLF | HYDAPBB, HYDAPLF |
+| [CTD](api/ctd_functions.md) | SBE 16Plus, SBE 37IM, SBE 52MP, glider CTDs | TEMPWAT, PRESWAT, CONDWAT, PRACSAL, DENSITY |
 
 ## Data product levels