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 <hferreiro@igalia.com>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771201}

docs/accessibility/brltty.md

@@ -65,8 +65,8 @@ To upload a change, use repo, something like this:
 ```
 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 .
 ```
 

docs/accessibility/patts.md

@@ -101,8 +101,8 @@ To upload the change, use repo upload, something like this:
 
 ```
 git commit -a
-  Bug:chromium:12345
-  Test:Write what you tested here
+  Bug: chromium:12345
+  Test: Write what you tested here
 repo upload .
 ```
 

docs/code_reviews.md

@@ -186,8 +186,8 @@ Otherwise the reviewer won't know to review the patch.
   * 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:reviewer1@chromium.org,reviewer2@chromium.org`
+  * Add a line "Tbr: <reviewer's email>" to the bottom of the change list
+    description. e.g. `Tbr: reviewer1@chromium.org,reviewer2@chromium.org`
 
   * 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

docs/speed/bot_health_sheriffing/how_to_disable_a_story.md

@@ -57,10 +57,10 @@ whereas an entry disabling a benchmark on an entire platform might look like:
 ## Submit changes
 
 Once you've committed your changes locally, your CL can be submitted with:
-
-- `No-Try:True`
-- `Tbr:`someone from [`tools/perf/OWNERS`](https://cs.chromium.org/chromium/src/tools/perf/OWNERS?q=tools/perf/owners&sq=package:chromium&dr)
-- `CC:`benchmark owner found in [this spreadsheet](https://docs.google.com/spreadsheets/u/1/d/1xaAo0_SU3iDfGdqDJZX_jRV0QtkufwHUKH3kQKF3YQs/edit#gid=0)
+
+- `No-Try: True`
+- `Tbr: `someone from [`tools/perf/OWNERS`](https://cs.chromium.org/chromium/src/tools/perf/OWNERS?q=tools/perf/owners&sq=package:chromium&dr)
+- `CC: `benchmark owner found in [this spreadsheet](https://docs.google.com/spreadsheets/u/1/d/1xaAo0_SU3iDfGdqDJZX_jRV0QtkufwHUKH3kQKF3YQs/edit#gid=0)
 - `Bug: `tracking bug
 
 *Please make sure to CC the benchmark owner so that they're aware that they've lost coverage.*