Update sweep_contract.jl

Author: chubbc

src/sweep_contract.jl

@@ -79,16 +79,20 @@ end
         fast=false, valid=false, planar=false, connected=false, report=false)
     sweep_contract(TN::TensorNetwork, χ, τ;
         fast=false, valid=false, planar=false, connected=false, report=false)
+
 Returns the contraction of the `TensorNetwork TN`, or the `LabelledTensorNetwork LTN` using
 the sweepline contraction algorithm of `arXiv:2101.04125`. The MPS is truncated down to a
 bond dimension of `χ` whenever any bond dimension exceeds `τ`.
+
 By default the network is checked for validity, planarised, and sweep-connected, where
 necessary. The keyword flags `valid`, `planar`, and `connected` can be used to skip these,
 or the flag `fast` can be used to skip them all. If these flags are enabled then contraction
 may fail on poorly formed networks.
+
 To avoid underflow/overflow issues the contraction value of the network is returned as a
 tuple `(f::Float64, i::Int64)` where `1≦f<2` or `f` is `0`, representing a value of `f*2^i`.
 The function `ldexp` can be used to convert this back to a Float64.
+
 `sweep_contract` is non-mutating and acts upon a deep copy of the network, where possible
 use the more efficient mutating version `sweep_contract!`.
 """
@@ -107,6 +111,7 @@ sweep_contract!(deepcopy(TN), χ, τ;
         fast=false, valid=false, planar=false, connected=false, report=false)
     sweep_contract!(TN::TensorNetwork, χ, τ;
         fast=false, valid=false, planar=false, connected=false, report=false)
+
 The mutating form of `sweep_contract`.
 """
 sweep_contract!(LTN::LabelledTensorNetwork, χ::Int, τ::Int;