fix: markdown formatting

doc/api/buffer.md

@@ -3783,14 +3783,16 @@ console.log(bytesWritten);
 ### `buf.base64urlWrite(string[, offset[, length]])`
 
 * `string` {string} String to write to `buf`.
-* `offset` {integer} Number of bytes to skip before starting to write `string`. **Default**: 0.
-* `length` {integer} Maximum number of bytes to write. **Default**: `buf.length - offset`.
+* `offset` {integer} Number of bytes to skip before starting to write `string`.
+  **Default**: 0.
+* `length` {integer} Maximum number of bytes to write.
+  **Default**: `buf.length - offset`.
 * Returns: {integer} The number of bytes written.
 
-Writes `string` to `buf` at `offset` according to the base64url character encoding
-and returns the number of bytes written. If `buf` did not contain enough space
-to fit the entire string, only part of `string` will be written. However,
-partially encoded characters will not be written.
+Writes `string` to `buf` at `offset` according to the base64url character 
+encoding and returns the number of bytes written. If `buf` did not contain 
+enough space to fit the entire string, only part of `string` will be written.
+However, partially encoded characters will not be written.
 
 In most cases, `buf.write` is preferable, especially if `encoding` is variable.