Fix documentation typos

This commit fixes some typos in the documentation.

Change-Id: I34ef7f863763bed2fb30421627968607bd787500

doc/source/ostestr.rst

@@ -112,7 +112,7 @@ exposed via the --regex option. For example::
     $ ostestr --regex 'magic\.regex'
 
 This will do a straight passthrough of the provided regex to testr.
-Additionally, ostestr allows you to specify a a blacklist file to define a set
+Additionally, ostestr allows you to specify a blacklist file to define a set
 of regexes to exclude. You can specify a blacklist file with the
 --blacklist-file/-b option, for example::
 

doc/source/subunit_trace.rst

@@ -20,7 +20,7 @@ Options
                         Disable printing failure debug information in realtime
   --fails, -f
                         Print failure debug information after the stream is
-                        proccesed
+                        processed
   --failonly
                         Don't print success items
   --perc-diff, -d
@@ -58,7 +58,7 @@ disabled by using --no-failure-debug, -n. For example::
 
     $ testr run --subunit | subunit-trace --no-failure-debug
 
-Rhere is also the option to print all failures together at the end of the test
+Here is also the option to print all failures together at the end of the test
 run before the summary view. This is done using the --fails/-f option. For
 example::
 
@@ -77,7 +77,7 @@ example::
 
      $ testr run --subunit | subunit-trace --failonly
 
-The last output option provided by subunit-trace is to diable the summary view
+The last output option provided by subunit-trace is to disable the summary view
 of the test run which is normally displayed at the end of a run. You can do
 this using the --no-summary option. For example::