add headings for synapses

doc/htmldoc/neurons/node_handles.rst

@@ -6,7 +6,7 @@ How to handle nodes (neurons and devices)
 In NEST 3.0, ``nest.Create()`` returns a *NodeCollection* object instead of a list of global IDs.
 This provides a more compact and flexible way for handling nodes.
 
-In most use cases, you will not need to make many changes to your scripts in NEST 3.0, unless you have used **topology** or **subnets**.
+In most use cases, you will not need to make many changes to your scripts in NEST 3, unless you have used **topology** or **subnets**.
 
 NodeCollection supports the following functionality:
 
@@ -342,4 +342,3 @@ can contain lists and single values at the same time.
     pop = nest.Create("iaf_psc_alpha", 2, params= {"I_e": [200.0, 150.0], "tau_m": 20.0, "V_m": [-77.0, -66.0]})
 
     print(pop.get(["I_e", "tau_m", "V_m"]))
-

doc/htmldoc/synapses/index.rst

@@ -9,23 +9,23 @@ Guides on using synapses in NEST
 
 .. grid:: 1 1 2 2
 
-   .. grid-item-card::  Managing coonnections
+   .. grid-item-card:: Managing coonnections
 
-      :ref:`connectivity_concepts`
-      :ref:`connection_generator`
-      :ref:`synapse_specification`
+      * :ref:`connectivity_concepts`
+      * :ref:`connection_generator`
+      * :ref:`synapse_spec`
 
-  .. grid-item-card::
+  .. grid-item-card:: Weight normalization
       :class-title: sd-d-flex-row sd-align-minor-center
       :link: weight_normalization
       :link-type: ref
 
-  .. grid-item-card::
+  .. grid-item-card:: Gap Junctions
       :class-title: sd-d-flex-row sd-align-minor-center
       :link: sim_gap_junctions
       :link-type: ref
 
-  .. grid-item-card::
+  .. grid-item-card:: Connection functionality
       :class-title: sd-d-flex-row sd-align-minor-center
       :link: handling_connections
       :link-type: ref