[8.2.x] Spelling (#12331)

Co-authored-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

doc/en/reference/fixtures.rst

@@ -39,7 +39,7 @@ Built-in fixtures
         Store and retrieve values across pytest runs.
 
    :fixture:`doctest_namespace`
-        Provide a dict injected into the docstests namespace.
+        Provide a dict injected into the doctests namespace.
 
    :fixture:`monkeypatch`
        Temporarily modify classes, functions, dictionaries,

doc/en/reference/reference.rst

@@ -1940,7 +1940,7 @@ All the command-line flags can be obtained by running ``pytest --help``::
 
     general:
       -k EXPRESSION         Only run tests which match the given substring
-                            expression. An expression is a Python evaluatable
+                            expression. An expression is a Python evaluable
                             expression where all names are substring-matched
                             against test names and their parent classes.
                             Example: -k 'test_method or test_other' matches all