docs: fix walker Container imports and stringify spacing docs

Author: CharlieHelps

docs/Container.md

@@ -85,7 +85,8 @@ Container nodes have access to all walker methods for traversing their child nod
 - `walkType(type, callback)` - Walk through all nodes of a specific type
 
 ```js
-import { parse, registerWalkers, Container } from 'postcss-values-parser';
+import { Container } from 'postcss';
+import { parse, registerWalkers } from 'postcss-values-parser';
 
 registerWalkers(Container);
 

docs/Parser.md

@@ -187,7 +187,8 @@ console.log(func.isColor); // true
 ### Complex Value Parsing
 
 ```js
-import { Container, parse, registerWalkers } from 'postcss-values-parser';
+import { Container } from 'postcss';
+import { parse, registerWalkers } from 'postcss-values-parser';
 
 // Walker helpers are not auto-registered in v7
 registerWalkers(Container);

docs/README.md

@@ -57,7 +57,8 @@ PostCSS provides a means to walk the entire AST to examine nodes of a particular
 Walker methods are not registered by default. Call `registerWalkers(Container)` once before using them. Each walker function has a signature of `walk{Node}s` (plural). For example, to walk all numeric values:
 
 ```js
-import { Container, parse, registerWalkers } from 'postcss-values-parser';
+import { Container } from 'postcss';
+import { parse, registerWalkers } from 'postcss-values-parser';
 
 // enable walker helpers
 registerWalkers(Container);

docs/Root.md

@@ -87,7 +87,8 @@ The Root node has access to all walker methods for traversing the AST. These met
 - `walkType(type, callback)` - Walk through all nodes of a specific type
 
 ```js
-import { parse, registerWalkers, Container } from 'postcss-values-parser';
+import { Container } from 'postcss';
+import { parse, registerWalkers } from 'postcss-values-parser';
 
 registerWalkers(Container);
 

docs/Stringify.md

@@ -144,17 +144,19 @@ console.log(root.toString(upperCaseStringifier));
 
 ## Advanced Usage
 
-### Preserving Formatting
+### Default Spacing Normalization
 
-The stringify function can preserve original formatting and spacing when nodes maintain source mapping information:
+The default stringify behavior normalizes spacing and does not preserve the original whitespace from the input:
 
 ```js
 import { parse } from 'postcss-values-parser';
 
-const root = parse('calc( 100px + 20% )'); // Note the extra spaces
-console.log(root.toString()); // Preserves original spacing
+const root = parse('calc( 1 + 2 )'); // Note the extra spaces
+console.log(root.toString()); // 'calc(1 + 2)'
 ```
 
+If you need custom whitespace/formatting output, pass a custom stringifier to `toString()`.
+
 ### Handling Source Maps
 
 When nodes have source mapping information, the stringify function can utilize this information to maintain accurate positioning:

docs/Walker.md

@@ -7,7 +7,8 @@ The walker helpers provide methods to traverse the AST and find nodes of specifi
 Walker methods are registered using the `registerWalkers` function:
 
 ```js
-import { registerWalkers, Container } from 'postcss-values-parser';
+import { Container } from 'postcss';
+import { registerWalkers } from 'postcss-values-parser';
 
 // Register all walker methods on the Container prototype
 registerWalkers(Container);
@@ -181,6 +182,7 @@ Type: `String`<br>
 _Required_
 
 The type of nodes to walk through. This should match the `type` property of the nodes you want to visit. Valid types include:
+
 - `'word'` - Word nodes
 - `'numeric'` - Numeric nodes
 - `'func'` - Function nodes
@@ -225,20 +227,21 @@ All walker methods accept a callback function with the following signature:
 function callback(node, index) {
   // node: The current node being visited
   // index: The index of this node type (0-based)
-  
+
   // Return false to stop walking
   if (someCondition) {
     return false;
   }
-  
+
   // Continue walking by returning nothing or true
 }
 ```
 
 ## Example Usage
 
 ```js
-import { parse, registerWalkers, Container } from 'postcss-values-parser';
+import { Container } from 'postcss';
+import { parse, registerWalkers } from 'postcss-values-parser';
 
 registerWalkers(Container);
 
@@ -255,7 +258,7 @@ console.log(numerics); // Array of numeric nodes
 // Find all functions
 root.walkFuncs((node) => {
   console.log(`Found function: ${node.name}`);
-  
+
   // Walk through function parameters
   node.walkWords((word) => {
     console.log(`  Parameter: ${word.value}`);
@@ -265,7 +268,7 @@ root.walkFuncs((node) => {
 // Stop walking early
 root.walkWords((node, index) => {
   console.log(`Word ${index}: ${node.value}`);
-  
+
   // Stop after finding 3 words
   if (index >= 2) {
     return false;