docs: correct jest and swc-sdk capability descriptions (#598)

Author: kdy1

packages/jest/README.tmpl.md

@@ -1,5 +1,5 @@
 # @swc/plugin-jest
 
-`@swc/plugin-jest` is a drop-in replacement for `babel-jest` that uses SWC to transform your code, enabling significantly faster Jest-based testing. It integrates with Jest's transformation pipeline so you can run your test suite with minimal configuration changes.
+`@swc/plugin-jest` is an SWC transform that hoists Jest calls such as `jest.mock`, `jest.unmock`, and `jest.enableAutomock` in the same spirit as Jest's Babel hoist behavior.
 
 ${CHANGELOG}

packages/swc-sdk/README.tmpl.md

@@ -1,6 +1,6 @@
 # @swc/plugin-swc-sdk
 
-`@swc/plugin-swc-sdk` provides build-time transformations from the `@swc/sdk` package. It supports converting static imports annotated with `/*#__DYNAMIC__*/` into dynamic imports, and processes `markAsPure` annotations so the SWC minifier can tree-shake the marked expressions.
+`@swc/plugin-swc-sdk` provides build-time transformations for the `@swc/sdk` package. It supports converting static imports annotated with `/*#__DYNAMIC__*/` into dynamic imports, and applies configured SDK feature-flag transforms.
 
 # Usage
 
@@ -63,12 +63,4 @@ export function sync() {
 }
 ```
 
-## `markAsPure`
-
-```js
-import { markAsPure } from "@swc/sdk";
-
-markAsPure(() => console.log("This will be removed by the SWC minifier"));
-```
-
 ${CHANGELOG}