Driver: Replace a couple of out of date terms in the docs

The Job base class was removed in r241310, so replace a couple of
references to it with Command. Also change another use of Job with
Action, since that's the term used in the source.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@241327 91177308-0d34-0410-b5e6-96231b3b80d8

docs/DriverInternals.rst

@@ -155,7 +155,7 @@ The driver functionality is conceptually divided into five stages:
    Subsequent stages should rarely, if ever, need to do any string
    processing.
 
-#. **Pipeline: Compilation Job Construction**
+#. **Pipeline: Compilation Action Construction**
 
    Once the arguments are parsed, the tree of subprocess jobs needed for
    the desired compilation sequence are constructed. This involves
@@ -266,7 +266,7 @@ The driver functionality is conceptually divided into five stages:
 #. **Translate: Tool Specific Argument Translation**
 
    Once a Tool has been selected to perform a particular Action, the
-   Tool must construct concrete Jobs which will be executed during
+   Tool must construct concrete Commands which will be executed during
    compilation. The main work is in translating from the gcc style
    command line options to whatever options the subprocess expects.
 
@@ -280,7 +280,7 @@ The driver functionality is conceptually divided into five stages:
    last of arguments corresponding to some option, or all arguments for
    an option.
 
-   The result of this stage is a list of Jobs (executable paths and
+   The result of this stage is a list of Commands (executable paths and
    argument strings) to execute.
 
 #. **Execute**