Fix typos and docs style (#3088)

* py::pickle typo

* correct dots and parentheses

docs/advanced/classes.rst

@@ -804,7 +804,7 @@ to bind these two functions:
             }
             }
         ));
         ));
 
 
-The ``__setstate__`` part of the ``py::picke()`` definition follows the same
+The ``__setstate__`` part of the ``py::pickle()`` definition follows the same
 rules as the single-argument version of ``py::init()``. The return type can be
 rules as the single-argument version of ``py::init()``. The return type can be
 a value, pointer or holder type. See :ref:`custom_constructors` for details.
 a value, pointer or holder type. See :ref:`custom_constructors` for details.
 
 

docs/faq.rst

@@ -5,7 +5,7 @@ Frequently asked questions
 ===========================================================
 ===========================================================
 
 
 1. Make sure that the name specified in PYBIND11_MODULE is identical to the
 1. Make sure that the name specified in PYBIND11_MODULE is identical to the
-filename of the extension library (without suffixes such as .so)
+filename of the extension library (without suffixes such as ``.so``).
 
 
 2. If the above did not fix the issue, you are likely using an incompatible
 2. If the above did not fix the issue, you are likely using an incompatible
 version of Python (for instance, the extension library was compiled against
 version of Python (for instance, the extension library was compiled against
@@ -170,7 +170,7 @@ complete independence of the symbols involved when not using
 ``-fvisibility=hidden``.
 ``-fvisibility=hidden``.
 
 
 Additionally, ``-fvisibility=hidden`` can deliver considerably binary size
 Additionally, ``-fvisibility=hidden`` can deliver considerably binary size
-savings.  (See the following section for more details).
+savings. (See the following section for more details.)
 
 
 
 
 .. _`faq:symhidden`:
 .. _`faq:symhidden`: