Remove use of HTML comments in framework, modules/contact, and python…

… docs

framework/doc/content/source/actions/AddMeshModifiersAction.md

@@ -4,5 +4,3 @@ Adds `MeshModifier` objects into the system that are listed under `MeshModifiers
 This action adds them to the [application](MooseApp.md).
 
 The preferred syntax for adding `MeshModifiers` is to add them in the `[Mesh]` block.
-
-<!-- !syntax parameters /Mesh/AddMeshModifiersAction -->

framework/doc/content/sqa/minimum_requirements.md

@@ -14,7 +14,7 @@ MacOS releases.
 | Memory | 8 GB (16 GBs for debug compilation) |
 | Disk Space | 30GB |
 
-<!-- comment to force MooseDocs to separate the tables -->
+!! comment to force MooseDocs to separate the tables
 
 | Libraries | Version / Information |
 | :- | :- |

modules/contact/doc/content/source/userobjects/NodalArea.md

@@ -2,9 +2,6 @@
 
 ## Description
 
-<!-- The `NodalArea` computes the nodal area along the boundaries. This object is typically utilized in contact simulations while computing the contact pressure along the interface
-(see [ContactPressureAux](auxkernels/ContactPressureAux.md)). -->
-
 The `NodalArea` object computes the tributary area of each node on a contact surface, which is used in node/face contact calculations. This object computes the value of a AuxVariable, but is implemented as a UserObject because the calculations involve iterations on the element faces, rather than the nodes. Note that the [Contact](Contact/index.md) action sets this object up automatically, so it is typically not necessary to include this in an input file.
 
 

python/doc/content/python/MooseDocs/extensions/autolink.md

@@ -45,8 +45,6 @@ The `optional` and `exact` settings are similarly applied when handling alternat
 !alert warning title=Try not to abuse alternative links.
 The `alternative` setting should not be used as a means to circumvent potentially broken content configurations, but rather consciously under special circumstances. For example, its main purpose is to provide a fallback when developing sites designed with [multiple configurations](MooseDocs/config.md#multiconfigs) and cross-links between them, but expeditiously building only one of those configurations such that certain content is only conditionally unavailable.
 
-<!--TODO: The above alert should include a link to the appropriate multiconfigs documentation when it becomes available. See #18137-->
-
 ## Automatic Link Shortcuts
 
 Markdown includes syntax for creating shortcuts (see [core.md#shortcut-link]). In MooseDown,