docs: convert alerts to use GitHub Flavored Markdown (GFM) (#16850)

followup to #16761 

thanks @lucasmelin !

+ thanks: @ethanndickson @Parkreiner @matifali @aqandrew 

- [x] update snippet
- [x] find/replace
- [x] spot-check


[preview](https://coder.com/docs/@16761-gfm-callouts/admin/templates/managing-templates/schedule)
(and others)

---------

Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Co-authored-by: M Atif Ali <atif@coder.com>

docs/admin/networking/index.md

@@ -18,7 +18,8 @@ networking logic.
 
 In order for clients and workspaces to be able to connect:
 
-> **Note:** We strongly recommend that clients connect to Coder and their
+> [!NOTE]
+> We strongly recommend that clients connect to Coder and their
 > workspaces over a good quality, broadband network connection. The following
 > are minimum requirements:
 >
@@ -33,7 +34,8 @@ In order for clients and workspaces to be able to connect:
 
 In order for clients to be able to establish direct connections:
 
-> **Note:** Direct connections via the web browser are not supported. To improve
+> [!NOTE]
+> Direct connections via the web browser are not supported. To improve
 > latency for browser-based applications running inside Coder workspaces in
 > regions far from the Coder control plane, consider deploying one or more
 > [workspace proxies](./workspace-proxies.md).
@@ -172,12 +174,9 @@ more.
 
 ## Browser-only connections
 
-<blockquote class="info">
-
-Browser-only connections is an Enterprise and Premium feature.
-[Learn more](https://coder.com/pricing#compare-plans).
-
-</blockquote>
+> [!NOTE]
+> Browser-only connections is an Enterprise and Premium feature.
+> [Learn more](https://coder.com/pricing#compare-plans).
 
 Some Coder deployments require that all access is through the browser to comply
 with security policies. In these cases, pass the `--browser-only` flag to
@@ -189,12 +188,9 @@ via the web terminal and
 
 ### Workspace Proxies
 
-<blockquote class="info">
-
-Workspace proxies are an Enterprise and Premium feature.
-[Learn more](https://coder.com/pricing#compare-plans).
-
-</blockquote>
+> [!NOTE]
+> Workspace proxies are an Enterprise and Premium feature.
+> [Learn more](https://coder.com/pricing#compare-plans).
 
 Workspace proxies are a Coder Enterprise feature that allows you to provide
 low-latency browser experiences for geo-distributed teams.