Doc: Minor typo fixes on internal notes documentation (#3093)

ansible_collections/arista/avd/docs/contribution/eos_designs_internal_notes.md

@@ -128,7 +128,7 @@ attributes/cached_properties will be rendered.
 
 The base class has a few important methods:
 
-- `keys()` return a list of attributes not beginning with an undercore and where the attribute is decorated with `cached_property`.
+- `keys()` return a list of attributes not beginning with an underscore and where the attribute is decorated with `cached_property`.
   These attributes represent the keys in the emulated dict.
 - `render()` loop over every attribute returned by `keys()` and return a dict with all the returned `cached_properties`, except
   `cached_property` with a value of `None` which will be skipped.
@@ -283,7 +283,7 @@ classDiagram
 ### avd_switch_facts
 
 The following model is set as `eos_designs_facts`. Most keys are optional depending on the
-usecase and configuration. The use of each key is tracked in the sections below.
+use case and configuration. The use of each key is tracked in the sections below.
 
 ```yaml
 avd_switch_facts:
@@ -415,7 +415,7 @@ outside of that, so any inline Jinja2 could not use these values.
 | switch.local_endpoint_trunk_groups | Complex calculations leveraging data from peers leading to compact output, so instead of repeating in multiple areas, we do it once and store the result. |
 | switch.mlag_ip | mlag_ip must be available to the mlag peer. |
 | switch.mlag_l3_ip | mlag_l3_ip must be available to the mlag peer. |
-| switch.mgmt_ip | mgmp_ip must be available to the mlag peer. |
+| switch.mgmt_ip | mgmt_ip must be available to the mlag peer. |
 | switch.uplink_peers | These are used to generate the "avd_topology_peers" fact covering downlinks for all devices in eos_designs_facts action plugin. |
 | switch.dc_name | Used for underlay HER flood-list calculations when using scope dc_name
 | switch.bgp_as | Known use of inline jinja in customer deployments |