voltage pmod + fix typos current sensor docs

Signed-off-by: Martijn Govers <Martijn.Govers@Alliander.com>

Author: mgovers

docs/user_manual/calculations.md

@@ -96,6 +96,11 @@ also of importance, i.e., the measurements should be topologically independent.
 Global angle current measurements require at least one voltage angle measurement to make sense. See also the [current sensor component documentation](./components.md#global-angle-current-sensors).
 ```
 
+```{note}
+It is not possible to add both a [power sensor](./components.md#generic-current-sensor) and a [current sensor](#./components.mdgeneric-current-sensor) to the same terminal of the same component.
+It is, however, allowed to have both a power sensor and a current sensor on the same branch if they are on different terminals.
+```
+
 ```{warning}
 The [iterative linear](#iterative-linear-state-estimation) and [Newton-Raphson](#newton-raphson-state-estimation) state estimation algorithms will assume angles to be zero by default (see the details about voltage sensors).
 In observable systems this helps better outputting correct results. On the other hand with unobservable systems, exceptions raised from calculations due to faulty results will be prevented.
@@ -462,6 +467,11 @@ $$
 
 Where $S_k$ and $\sigma_{P,k}$ and $\sigma_{Q,k}$ are the measured value and the standard deviation of the individual appliances.
 
+```{note}
+It is not possible to add both a [power sensor](./components.md#generic-current-sensor) and a [current sensor](#./components.mdgeneric-current-sensor) to the same terminal of the same component.
+It is, however, allowed to have both a power sensor and a current sensor on the same branch if they are on different terminals.
+```
+
 #### State estimate sensor transformations
 
 Sometimes, measurements need to be transformed between coordinate spaces. For example, current measurements are in polar coordinates (magnitude and angle), but it is beneficial to transform them to separate real and imaginary components per phase, with each their own variances.

docs/user_manual/components.md

@@ -650,6 +650,11 @@ In the state estimation result, the power from this injection is distributed equ
 Because of this distribution, at least one appliance is required to be connected to the node where an injection sensor is placed for it to function.
 ```
 
+```{note}
+It is not possible to add both a [power sensor](#generic-current-sensor) and a [current sensor](#generic-current-sensor) to the same terminal of the same component.
+It is, however, allowed to have both a power sensor and a current sensor on the same branch if they are on different terminals.
+```
+
 ##### Input
 
 | name                     | data type                                                                     | unit             | description                                                                                                                                                                                 |                                                           required                                                            |  update  |                     valid values                     |
@@ -741,6 +746,11 @@ The terminal is connecting the from/to end of a `branch` (except `link`) and a `
 Due to the high admittance of a `link` it is chosen that a current sensor cannot be coupled to a `link`, even though a link is a `branch`
 ```
 
+```{note}
+It is not possible to add both a [power sensor](#generic-current-sensor) and a [current sensor](#generic-current-sensor) to the same terminal of the same component.
+It is, however, allowed to have both a power sensor and a current sensor on the same branch if they are on different terminals.
+```
+
 ##### Input
 
 | name                     | data type                                                                     | unit       | description                                                                                                                               | required |  update  |                     valid values                     |
@@ -826,11 +836,11 @@ As a result, the local angle current sensors have a different sign convention fr
 $$
    \begin{eqnarray}
         & i_{\text{residual}} = i_{\text{measured}} - i_{\text{state}} && \\
-        & i_{\text{angle},\text{residual}} = i_{\text{angle},\text{measured}} - i_{\text{angle},\text{state}} \pmod 2 \pi
+        & i_{\text{angle},\text{residual}} = i_{\text{angle},\text{measured}} - i_{\text{angle},\text{state}} \pmod{2 \pi}
    \end{eqnarray}
 $$
 
-The $\pmod 2\pi$ is handled such that $-\pi \lt i_{\text{angle},\text{residual}} \leq \pi$.
+The $\pmod{2\pi}$ is handled such that $-\pi \lt i_{\text{angle},\text{residual}} \leq \pi$.
 
 ## Fault