doc: replace var method parameter index with start

Author: wkliao

docs/source/tutorial/non_blocking.rst

@@ -14,14 +14,14 @@ Nonblocking Write
 
  Write requests can be posted by the method call of :meth:`Variable.iput_var`.
  Same as :meth:`Variable.put_var`, the behavior of :meth:`Variable.iput_var`
- varies depending on the pattern of provided optional arguments - `index`,
- `start`, `count`, `stride`, and `imap` as shown below. Note that the method
- only posts the request, which is not committed until :meth:`File.wait`. The
- method call returns a request id that can be optionally passed to
- :meth:`File.wait` to select this request.
+ varies depending on the pattern of provided optional arguments - `start`,
+ `count`, `stride`, and `imap` as shown below. Note that the method only posts
+ the request, which is not committed until :meth:`File.wait`. The method call
+ returns a request id that can be optionally passed to :meth:`File.wait` to
+ select this request.
 
  - `data` - Request to write an entire variable
- - `data`, `index` - Request to write a single data value
+ - `data`, `start` - Request to write a single data value
  - `data`, `start`, `count` - Request to write an array of values
  - `data`, `start`, `count`, `stride` - Request to write a subarray of values
  - `data`, `start`, `count`, `imap` - Request to write a mapped array of values
@@ -58,10 +58,10 @@ Nonblocking Read
  the method call returns a request id that can be optionally passed to
  :meth:`File.wait` to select this request. Similar to :meth:`Variable.get_var`,
  the behavior of :meth:`Variable.iget_var` varies depending on the pattern of
- provided optional arguments - `index`, `start`, `count`, `stride`, and `imap`.
+ provided optional arguments - `start`, `count`, `stride`, and `imap`.
 
  - `buff` - Request to read an entire variable
- - `buff`, `index` - Request to read a single data value
+ - `buff`, `start` - Request to read a single data value
  - `buff`, `start`, `count` - Request to read an array of values
  - `buff`, `start`, `count`, `stride` - Request to read a subarray of values
  - `buff`, `start`, `count`, `imap` - Request to read a mapped array of values

docs/source/tutorial/read_write.rst

@@ -42,16 +42,16 @@ Method Call of put_var()/get_var()
  written. :meth:`Variable.get_var` requires `buff` as a mandatory argument,
  which serves as a read buffer that stores values to be read. The behavior of
  :meth:`Variable.put_var` and :meth:`Variable.get_var` varies depending on the
- pattern of provided optional arguments - `index`, `start`, `count`, `stride`,
- and `imap`. The suffix `_all` indicates this is collective I/O in contrast to
+ pattern of provided optional arguments - `start`, `count`, `stride`, and
+ `imap`. The suffix `_all` indicates this is collective I/O in contrast to
  independent I/O (without `_all`).
 
 Read from netCDF variables
  For reading, the behavior of :meth:`Variable.get_var` depends on the following
  provided input parameter pattern:
 
  - `buff` - Read an entire variable
- - `buff`, `index` - Read a single data value
+ - `buff`, `start` - Read a single data value
  - `buff`, `start`, `count` - Read an array of values
  - `buff`, `start`, `count`, `stride` - Read a subarray of values
  - `buff`, `start`, `count`, `imap`, `buff` - Read a mapped array of values
@@ -84,7 +84,7 @@ Write to netCDF variables
  provided input parameter pattern:
 
  - `data` - Write an entire variable
- - `data`, `index` - Write a single data value (a single element)
+ - `data`, `start` - Write a single data value (a single element)
  - `data`, `start`, `count` - Write an array of values
  - `data`, `start`, `count`, `stride` - Write a subarray of values
  - `data`, `start`, `count`, `imap` - Write a mapped array of values