Update note links

Author: sosukesuzuki

stage-1-proposals.md

@@ -82,8 +82,8 @@ Proposals follow [this process document](https://tc39.es/process-document/).
 | [JavaScript module fragments][module-fragments]                                              | Daniel Ehrenberg                                       | Daniel Ehrenberg<br />Mark Miller                     | <sub>[March&nbsp;2021][module-fragments-notes]</sub>              |
 | [Change Array by copy][change-array-by-copy]                                                 | Robin Ricard                                           | Robin Ricard                                          | <sub>[April&nbsp;2021][change-array-by-copy-notes]</sub>          |
 | [Limited ArrayBuffer][limited-array-buffer]                                                  | Jack Works                                             | Jack Works                                            | <sub>[April&nbsp;2021][limited-array-buffer-notes]</sub>          |
-| [ArrayBuffer to/from Base64][arraybuffer-base64]                                             | Kevin Gibbons                                          | Kevin Gibbons                                         | <sub>July&nbsp;2021</sub>                                         |
-| [Array Grouping][array-grouping]                                                             | Justin Ridgewell                                       | Justin Ridgewell                                      | <sub>July&nbsp;2021</sub>                                         |
+| [ArrayBuffer to/from Base64][arraybuffer-base64]                                             | Kevin Gibbons                                          | Kevin Gibbons                                         | <sub>[July&nbsp;2021][arraybuffer-base64-notes]</sub>             |
+| [Array Grouping][array-grouping]                                                             | Justin Ridgewell                                       | Justin Ridgewell                                      | <sub>[July&nbsp;2021][array-grouping-notes]</sub>                 |
 
 See also the [active proposals](README.md), [stage 0 proposals](stage-0-proposals.md), [finished proposals](finished-proposals.md), and [inactive proposals](inactive-proposals.md) documents.
 
@@ -240,4 +240,6 @@ See also the [active proposals](README.md), [stage 0 proposals](stage-0-proposal
 [limited-array-buffer]: https://github.com/tc39/proposal-limited-arraybuffer
 [limited-array-buffer-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-04/apr-21.md#read-only-arraybuffer-and-fixed-view-of-arraybuffer-for-stage-1
 [arraybuffer-base64]: https://github.com/bakkot/proposal-arraybuffer-base64
+[arraybuffer-base64-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-07/july-14.md#arraybuffer-tofrom-base64
 [array-grouping]: https://github.com/tc39/proposal-array-grouping
+[array-grouping-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2021-07/july-14.md#array-filtering--grouping-for-stage-2