Update compilerArgs description. (#10339)

Author: sean-mcmanus

Extension/c_cpp_properties.schema.json

@@ -21,8 +21,8 @@
                         "type": "string"
                     },
                     "compilerArgs": {
-                        "markdownDescription": "Compiler arguments to modify the includes or defines used, e.g. `-nostdinc++`, `-m32`, etc.",
-                        "descriptionHint": "Markdown text between `` should not be translated or localized (they represent literal text) and the capitalization, spacing, and punctuation (including the ``) should not be altered.",
+                        "markdownDescription": "Compiler arguments to modify the includes or defines used, e.g. `-nostdinc++`, `-m32`, etc. Arguments that take additional space-delimited arguments should be entered as separate arguments in the array, e.g. for `--sysroot <arg>` use `\"--sysroot\", \"<arg>\"`.",
+                        "descriptionHint": "Markdown text between `` should not be translated or localized (they represent literal text) and the capitalization, spacing, and punctuation (including the ``) should not be altered, except potentially the `arg` text which is a placeholder and not literal text, i.e. an abbreviation for `argument`.",
                         "type": "array",
                         "items": {
                             "type": "string"

Extension/ui/settings.html

@@ -495,7 +495,7 @@
 
     <div class="section">
         <div class="section-title" data-loc-id="compiler.args">Compiler arguments</div>
-        <div class="section-text" data-loc-id="compiler.arguments">Compiler arguments to modify the includes or defines used, e.g. <code>-nostdinc++</code>, <code>-m32</code>, etc.</div>
+        <div class="section-text" data-loc-id="compiler.arguments">Compiler arguments to modify the includes or defines used, e.g. <code>-nostdinc++</code>, <code>-m32</code>, etc. Arguments that take additional space-delimited arguments should be entered as separate arguments in the array, e.g. for <code>--sysroot &lt;arg&gt;</code> use <code>"--sysroot", "&lt;arg&gt;"</code>.</div>
         <div>
             <div class="section-note" data-loc-id="one.argument.per.line">One argument per line.</div>
             <textarea name="inputValue" id="compilerArgs" rows="4" cols="93" style="width: 800px"></textarea>