Update toolsnaps with aligned reaction tool descriptions

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: timrogers

pkg/github/__toolsnaps__/add_issue_comment_reaction.snap

@@ -4,7 +4,7 @@
     "openWorldHint": true,
     "title": "Add Issue Comment Reaction"
   },
-  "description": "Add an emoji reaction to a GitHub issue comment",
+  "description": "Add a reaction to an issue comment.",
   "inputSchema": {
     "properties": {
       "comment_id": {

pkg/github/__toolsnaps__/add_issue_reaction.snap

@@ -4,7 +4,7 @@
     "openWorldHint": true,
     "title": "Add Issue Reaction"
   },
-  "description": "Add an emoji reaction to a GitHub issue",
+  "description": "Add a reaction to an issue.",
   "inputSchema": {
     "properties": {
       "content": {

pkg/github/__toolsnaps__/add_pull_request_review_comment_reaction.snap

@@ -4,7 +4,7 @@
     "openWorldHint": true,
     "title": "Add Pull Request Review Comment Reaction"
   },
-  "description": "Add an emoji reaction to a GitHub pull request review comment",
+  "description": "Add a reaction to a pull request review comment.",
   "inputSchema": {
     "properties": {
       "comment_id": {