Add experimental icons

Author: mpilgrem

doc/build_command.md

@@ -363,17 +363,19 @@ expressions, and generate a profiling report in tests or benchmarks.
 
 ### `--[no-]split-objs` flag
 
+:octicons-beaker-24: Experimental
+
 Default: Disabled
 
 Set the flag to enable the GHC option `--split-objs`. This will reduce output
 size (at the cost of build time).
 
 !!! note
 
-    This feature is EXPERIMENTAL, and its behavior may be changed and improved.
-    You will need to clean your workdirs before use. If you want to compile all
-    dependencies with split-objs, you will need to delete the snapshot (and all
-    snapshots that could reference that snapshot).
+    The behaviour of this feature may be changed and improved. You will need to
+    clean your project's Stack working directory before use. If you want to
+    compile all dependencies with split-objs, you will need to delete the
+    snapshot (and all snapshots that could reference that snapshot).
 
 ### `--no-strip` flag
 

doc/query_command.md

@@ -2,6 +2,8 @@
 
 # The `stack query` command
 
+:octicons-beaker-24: Experimental
+
 [:octicons-tag-24: 0.1.6.0](https://github.com/commercialhaskell/stack/releases/tag/v0.1.6.0)
 
 ~~~text

doc/yaml_configuration.md

@@ -367,7 +367,9 @@ The name `allow-newer` is chosen to match the commonly-used Cabal option.
 allow-newer: true
 ~~~
 
-### allow-newer-deps (experimental)
+### allow-newer-deps
+
+:octicons-beaker-24: Experimental
 
 [:octicons-tag-24: 2.9.3](https://github.com/commercialhaskell/stack/releases/tag/v2.9.3)
 
@@ -504,7 +506,9 @@ compiler: ghc-8.6.4
 compiler-check: match-exact
 ~~~
 
-#### Building GHC from source (experimental)
+#### Building GHC from source
+
+:octicons-beaker-24: Experimental
 
 [:octicons-tag-24: 2.1.1](https://github.com/commercialhaskell/stack/releases/tag/v2.1.1)