fix missing links in docstring of correlation functions

Author: ytdHuang

src/correlations.jl

@@ -21,7 +21,7 @@ end
 
 Returns the two-times correlation function of three operators ``\hat{A}``, ``\hat{B}`` and ``\hat{C}``: ``\left\langle \hat{A}(t) \hat{B}(t + \tau) \hat{C}(t) \right\rangle`` for a given initial state ``|\psi_0\rangle``.
 
-If the initial state `ψ0` is given as `nothing`, then the [`steadystate`] will be used as the initial state. Note that this is only implemented if `H` is constant ([`QuantumObject`](@ref)).
+If the initial state `ψ0` is given as `nothing`, then the [`steadystate`](@ref) will be used as the initial state. Note that this is only implemented if `H` is constant ([`QuantumObject`](@ref)).
 """
 function correlation_3op_2t(
     H::AbstractQuantumObject{DataType,HOpType},
@@ -74,7 +74,7 @@ end
 
 Returns the one-time correlation function of three operators ``\hat{A}``, ``\hat{B}`` and ``\hat{C}``: ``\left\langle \hat{A}(0) \hat{B}(\tau) \hat{C}(0) \right\rangle`` for a given initial state ``|\psi_0\rangle``.
 
-If the initial state `ψ0` is given as `nothing`, then the [`steadystate`] will be used as the initial state. Note that this is only implemented if `H` is constant ([`QuantumObject`](@ref)).
+If the initial state `ψ0` is given as `nothing`, then the [`steadystate`](@ref) will be used as the initial state. Note that this is only implemented if `H` is constant ([`QuantumObject`](@ref)).
 """
 function correlation_3op_1t(
     H::AbstractQuantumObject{DataType,HOpType},
@@ -112,7 +112,7 @@ end
 
 Returns the two-times correlation function of two operators ``\hat{A}`` and ``\hat{B}`` : ``\left\langle \hat{A}(t + \tau) \hat{B}(t) \right\rangle`` for a given initial state ``|\psi_0\rangle``.
 
-If the initial state `ψ0` is given as `nothing`, then the [`steadystate`] will be used as the initial state. Note that this is only implemented if `H` is constant ([`QuantumObject`](@ref)).
+If the initial state `ψ0` is given as `nothing`, then the [`steadystate`](@ref) will be used as the initial state. Note that this is only implemented if `H` is constant ([`QuantumObject`](@ref)).
 
 When `reverse=true`, the correlation function is calculated as ``\left\langle \hat{A}(t) \hat{B}(t + \tau) \right\rangle``.
 """
@@ -156,7 +156,7 @@ end
 
 Returns the one-time correlation function of two operators ``\hat{A}`` and ``\hat{B}`` : ``\left\langle \hat{A}(\tau) \hat{B}(0) \right\rangle`` for a given initial state ``|\psi_0\rangle``.
 
-If the initial state `ψ0` is given as `nothing`, then the [`steadystate`] will be used as the initial state. Note that this is only implemented if `H` is constant ([`QuantumObject`](@ref)).
+If the initial state `ψ0` is given as `nothing`, then the [`steadystate`](@ref) will be used as the initial state. Note that this is only implemented if `H` is constant ([`QuantumObject`](@ref)).
 
 When `reverse=true`, the correlation function is calculated as ``\left\langle \hat{A}(0) \hat{B}(\tau) \right\rangle``.
 """