extension import docs

Author: jgreener64

docs/src/api.md

@@ -6,9 +6,9 @@ CurrentModule = BioStructures
 
 Package extensions are used in order to reduce the number of dependencies:
 - To use `LongAA`, call `using BioSequences`.
-- To use `pairalign`, [`superimpose!`](@ref), [`rmsd`](@ref)/[`displacements`](@ref) with the `superimpose` option or [`Transformation`](@ref) on structural elements, call `using BioSequences, BioAlignments`.
+- To use `pairalign`, [`superimpose!`](@ref), [`rmsd`](@ref)/[`displacements`](@ref) with the `superimpose` option or [`Transformation`](@ref) on structural elements, call `using BioAlignments`.
 - To use `DataFrame`, call `using DataFrames`.
-- To use `MetaGraph`, call `using Graphs, MetaGraphs`.
+- To use `MetaGraph`, call `using MetaGraphs`.
 - To use [`MMTFDict`](@ref) or [`writemmtf`](@ref), call `import MMTF`.
 - To use [`rundssp!`](@ref), [`rundssp`](@ref) or the `run_dssp` option with `read`/[`retrievepdb`](@ref), call `using DSSP_jll`.
 - To use [`runstride!`](@ref), [`runstride`](@ref) or the `run_stride` option with `read`/[`retrievepdb`](@ref), call `using STRIDE_jll`.

docs/src/documentation.md

@@ -424,7 +424,7 @@ Various functions are provided to calculate spatial quantities for proteins:
 | [`superimpose!`](@ref)       | Superimpose one element onto another                                                             |
 | [`rmsd`](@ref)               | RMSD between two elements, with or without superimposition                                       |
 | [`displacements`](@ref)      | `Vector` of displacements between two elements, with or without superimposition                  |
-| `MetaGraph`                  | Construct a `MetaGraph` of contacting elements (call `using Graphs, MetaGraphs` first)           |
+| `MetaGraph`                  | Construct a `MetaGraph` of contacting elements (call `using MetaGraphs` first)                   |
 
 The [`omegaangle`](@ref), [`phiangle`](@ref) and [`psiangle`](@ref) functions can take either a pair of residues or a chain and a position.
 The [`omegaangle`](@ref) and [`phiangle`](@ref) functions measure the angle between the residue at the given index and the one before.
@@ -483,7 +483,7 @@ To carry out superimposition, BioStructures.jl carries out a sequence alignment
 For example:
 
 ```julia
-using BioSequences, BioAlignments
+using BioAlignments
 
 # Change the coordinates of element 1 to superimpose it onto element 2
 # Do sequence alignment with standard residues and calculate the transformation with Cα atoms (the default)