Add a space after a colon in Gerrit-style git footer examples.

Follow up to https://crrev.com/747851 to provide good examples to
readers in the documentation.

Change-Id: I14e1aa32abce51c9ae1f7499737ff612e440733c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212962
Reviewed-by: Henrique Ferreiro <[email protected]>
Commit-Queue: Lei Zhang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#771201}
diff --git a/docs/accessibility/brltty.md b/docs/accessibility/brltty.md
index 7c29d305..e05f1d7 100644
--- a/docs/accessibility/brltty.md
+++ b/docs/accessibility/brltty.md
@@ -65,8 +65,8 @@
 ```
 repo start <branch_name> .
 git commit -a
-  Bug:chromium:12345
-  Test:Write what you tested here
+  Bug: chromium:12345
+  Test: Write what you tested here
 repo upload .
 ```
 
diff --git a/docs/accessibility/patts.md b/docs/accessibility/patts.md
index 637be7885..719d97c 100644
--- a/docs/accessibility/patts.md
+++ b/docs/accessibility/patts.md
@@ -101,8 +101,8 @@
 
 ```
 git commit -a
-  Bug:chromium:12345
-  Test:Write what you tested here
+  Bug: chromium:12345
+  Test: Write what you tested here
 repo upload .
 ```
 
diff --git a/docs/code_reviews.md b/docs/code_reviews.md
index 1fc688d1..dcb5267d 100644
--- a/docs/code_reviews.md
+++ b/docs/code_reviews.md
@@ -186,8 +186,8 @@
   * Add the reviewer's email address in the code review tool's reviewer field
     like normal.
 
-  * Add a line "Tbr:<reviewer's email>" to the bottom of the change list
-    description. e.g. `Tbr:[email protected],[email protected]`
+  * Add a line "Tbr: <reviewer's email>" to the bottom of the change list
+    description. e.g. `Tbr: [email protected],[email protected]`
 
   * Type a message so that the owners in the TBR list can understand who is
     responsible for reviewing what, as part of their post-commit review
diff --git a/docs/speed/bot_health_sheriffing/how_to_disable_a_story.md b/docs/speed/bot_health_sheriffing/how_to_disable_a_story.md
index 496391e..3eb10fc 100644
--- a/docs/speed/bot_health_sheriffing/how_to_disable_a_story.md
+++ b/docs/speed/bot_health_sheriffing/how_to_disable_a_story.md
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