a few docs fixes and language improvements (#4472)

diff --git a/docs/x509/reference.rst b/docs/x509/reference.rst
index 079fef9..8330b2a 100644
--- a/docs/x509/reference.rst
+++ b/docs/x509/reference.rst
@@ -1371,7 +1371,7 @@
 
     .. attribute:: value
 
-        :type: `bytes`
+        :type: bytes
 
 X.509 Extensions
 ~~~~~~~~~~~~~~~~
@@ -2261,7 +2261,7 @@
 
     .. attribute:: value
 
-        :type: byte
+        :type: bytes
 
         Returns the DER encoded bytes payload of the extension.