Added missing periods for consistency and correctness (#514)

Added missing periods in various parts of the text to ensure consistency and correctness in writing style. This revision maintains uniform formatting throughout the document, improves readability, and aligns the punctuation with the rest of the content for a more polished and structured appearance.

Author: shaymolcho

README.md

@@ -492,7 +492,7 @@ Iterate over each mapping between an original source/line/column and a
 generated line/column in this source map.
 
 - `callback`: The function that is called with each mapping. Mappings have the
-  form `{ source, generatedLine, generatedColumn, originalLine, originalColumn, name }`
+  form `{ source, generatedLine, generatedColumn, originalLine, originalColumn, name }`.
 
 - `context`: Optional. If specified, this object will be the value of `this`
   every time that `callback` is called.
@@ -665,9 +665,9 @@ var node = new SourceNode(1, 2, "a.cpp", [
 
 Creates a SourceNode from generated code and a SourceMapConsumer.
 
-- `code`: The generated code
+- `code`: The generated code.
 
-- `sourceMapConsumer` The SourceMap for the generated code
+- `sourceMapConsumer` The SourceMap for the generated code.
 
 - `relativePath` The optional path that relative sources in `sourceMapConsumer`
   should be relative to.
@@ -711,9 +711,9 @@ node.prepend("/** Build Id: f783haef86324gf **/\n\n");
 Set the source content for a source file. This will be added to the
 `SourceMap` in the `sourcesContent` field.
 
-- `sourceFile`: The filename of the source file
+- `sourceFile`: The filename of the source file.
 
-- `sourceContent`: The content of the source file
+- `sourceContent`: The content of the source file.
 
 ```js
 node.setSourceContent(