Fix three greek letter typos

docs/src/Model_Concept_Overview/model_notation.md

@@ -136,8 +136,8 @@ $\mathcal{W} \subseteq \mathcal{G}$ | where $\mathcal{W}$ set of hydroelectric g
 |$\alpha^{Contingency,Aux}_{y,z} \in \{0,1\}$ | Binary variable that is set to be 1 if the total installed capacity  $\Delta^{\text{total}}_{y,z} > 0$ for any generator $y \in \mathcal{UC}$ and zone $z$, and can be 0 otherwise |
 |$\Phi_{l,t} \in \mathbb{R}_+$ | Power flow in line $l$ at time step $t$ \[MWh\]|
 |$\theta_{z,t} \in \mathbb{R}$ | Volta phase angle in zone $z$ at time step $t$ \[radian\]|
-|$v_{y,z,t}$ | Commitment state of the generation cluster $y$ in zone $z$ at time $t$|
-|$\mathcal{X}_{y,z,t}$ | Number of startup decisions,  of the generation cluster $y$ in zone $z$ at time $t$|
+|$\nu_{y,z,t}$ | Commitment state of the generation cluster $y$ in zone $z$ at time $t$|
+|$\chi_{y,z,t}$ | Number of startup decisions,  of the generation cluster $y$ in zone $z$ at time $t$|
 |$\zeta_{y,z,t}$ | Number of shutdown decisions,  of the generation cluster $y$ in zone $z$ at time $t$|
 |$\mathcal{Q}_{o,n} \in \mathbb{R}_+$ | Inventory of storage of type $o$ at the beginning of input period $n$ \[MWh]|
 |$\Delta\mathcal{Q}_{o,m} \in \mathbb{R}$ | Excess storage inventory built up during representative period $m$ \[MWh]|

src/model/resources/thermal/thermal_commit.jl

@@ -275,7 +275,7 @@ When modeling frequency regulation and spinning reserves contributions, thermal
 
 ```math
 \begin{aligned}
-	\Theta_{y,z,t} - f_{y,z,t} \geq \rho^{min}_{y,z} \times Omega^{size}_{y,z} \times \nu_{y,z,t}
+	\Theta_{y,z,t} - f_{y,z,t} \geq \rho^{min}_{y,z} \times \Omega^{size}_{y,z} \times \nu_{y,z,t}
 	\hspace{1.5cm} \forall y \in \mathcal{UC}, \forall z \in \mathcal{Z}, \forall t \in \mathcal{T}
 \end{aligned}
 ```