chore(lang): update symbol completion description

Every language will have a symbol completion, which is the most basic completion.
- Java: com.intellij.codeInsight.completion.JavaKeywordCompletion
- Kotlin: org.jetbrains.kotlin.idea.completion.KotlinCompletionContributor
- Python: com.jetbrains.python.codeInsight.completion.PyClassNameCompletionContributor

Author: phodal

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/completion/BuiltinCommandProvider.kt

@@ -16,7 +16,14 @@ enum class BuiltinCommand(
 ) {
     FILE("file", "Read the content of a file", AllIcons.Actions.AddFile, true, true),
     REV("rev", "Read git change by file", AllIcons.Vcs.History, true, true),
-    SYMBOL("symbol", "Read content by Java/Kotlin canonicalName", AllIcons.Actions.GroupBy, false),
+
+    /**
+     * Every language will have a symbol completion, which is the most basic completion, for example:
+     * - Java: [com.intellij.codeInsight.completion.JavaKeywordCompletion]
+     * - Kotlin: [org.jetbrains.kotlin.idea.completion.KotlinCompletionContributor]
+     * - Python: [com.jetbrains.python.codeInsight.completion.PyClassNameCompletionContributor]
+     */
+    SYMBOL("symbol", "[TODO] Read content by Java/Kotlin canonicalName", AllIcons.Actions.GroupBy, false),
     WRITE("write", "Write content to a file, /write:path/to/file:L1-L2", AllIcons.Actions.Edit, true, true),
     PATCH("patch", "Apply patch to a file, /patch:path/to/file", AllIcons.Vcs.Patch_file, false),
     RUN("run", "Run the content of a file", AllIcons.Actions.Execute, false),