Rename 'Examples' section to 'Usage'

They aren't really examples. We should make a new toctree for that and
then bring in code from the dyninst/examples repo.

docs/dataflowAPI/index.rst

@@ -75,10 +75,10 @@ Stack Height
    Stack Height represents the difference between a value in an abstract
    location and the stack pointer at a function’s call site.
 
-.. _`sec:dataflow-examples`:
+.. _`sec:dataflow-usage`:
 
-Examples
-========
+Usage
+=====
 
 We show several examples of how to use DataflowAPI. In these examples,
 we assume that the mutatee has been parsed and we have function and

docs/parseAPI/index.rst

@@ -101,10 +101,10 @@ binary code:
    provides a SymtabAPI-based code source that understands ELF, COFF and
    PE file formats.
 
-.. _`sec:example`:
+.. _`sec:parseapi-usage`:
 
-Examples
-========
+Usage
+=====
 
 Function Disassembly
 --------------------

docs/patchAPI/index.rst

@@ -218,10 +218,10 @@ PatchAPI for 1st party code patching.
    Furthermore, Patcher implicitly adds Instrumenter to the end of the
    Command list to generate binary code and install the instrumentation.
 
-.. _sec-example:
+.. _sec-patchapi-usage:
 
-Examples
-========
+Usage
+=====
 
 To illustrate the ideas of PatchAPI, we present some simple code
 examples that demonstrate how the API can be used.

docs/symtabAPI/index.rst

@@ -175,8 +175,10 @@ useful because libraries can load at different addresses in different
 processes. Each AddressLookup instance is associated with, and provides
 mapping for, one process.
 
-Examples
-========
+.. _symtabapi-usage:
+
+Usage
+=====
 
 To illustrate the ideas in the API, this section presents several short
 examples that demonstrate how the API can be used. SymtabAPI has the