docs: admin-guide: reporting-issues.rst: replace some characters

The conversion tools used during DocBook/LaTeX/html/Markdown->ReST
conversion and some cut-and-pasted text contain some characters that
aren't easily reachable on standard keyboards and/or could cause
troubles when parsed by the documentation build system.

Replace the occurences of the following characters:

	- U+00a0 (' '): NO-BREAK SPACE
	  as it can cause lines being truncated on PDF output
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/551a2af0e654226067e5c376d3e2d959cc738f39.1623826294.git.mchehab+huawei@kernel.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/reporting-issues.rst

@@ -1248,7 +1248,7 @@ paragraph makes the severeness obvious.
 
 In case you performed a successful bisection, use the title of the change that
 introduced the regression as the second part of your subject. Make the report
-also mention the commit id of the culprit. In case of an unsuccessful bisection,
+also mention the commit id of the culprit. In case of an unsuccessful bisection,
 make your report mention the latest tested version that's working fine (say 5.7)
 and the oldest where the issue occurs (say 5.8-rc1).