Set CurrentModule for API

docs/src/api.md

-# MRIBuilder.jl API
+```@meta
+CurrentModule = MRIBuilder
+```
 
+# MRIBuilder.jl API
 ```@autodocs
 Modules = [MRIBuilder]
 ```
\ No newline at end of file

docs/src/index.md

-```@meta
-CurrentModule = MRIBuilder
-```
-
 # MRIBuilder
 [MRIBuilder](https://git.fmrib.ox.ac.uk/ndcn0236/mribuilder.jl) allows for the creation and optimisation of MRI sequences within [Julia](https://julialang.org).