doc: git-add: clarify DESCRIPTION section

Slightly reword the first sentence ("you use" instead of "Git stores")

Julia Evans (2):
doc: git-add: clarify intro & add an example
doc: git-add: simplify discussion of ignored files

 Documentation/git-add.adoc | 34 ++++++++++++++++------------------
 1 file changed, 16 insertions(+), 18 deletions(-)

base-commit: c44beea485f0f2feaf460e2ac87fdd5608d63cf0
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1952%2Fjvns%2Fclarify-add-v4
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1952/jvns/clarify-add-v4
Pull-Request: https://github.com/gitgitgadget/git/pull/1952

Range-diff vs v3:

 1:  c44beea485 < -:  ---------- Git 2.51
 2:  080720c059 ! 1:  57947d5a3e doc: git-add: clarify intro & add an example

@@ Documentation/git-add.adoc: git add [--verbose | -v] [--dry-run | -n] [--force |
-the commit command, you must use the add command to add any new or -modified files to the index.
+Add contents of new or changed files to the index. The "index" (also
-+known as "staging area") is where Git stores the contents of the next -+commit.
++known as the "staging area") is what you use to prepare the contents of ++the next commit.
+
+When you run git commit without any other arguments, it will only +commit staged changes. For example, if you've edited file.c and want
3: fc2ec305a9 = 2: f57effdd2b doc: git-add: simplify discussion of ignored files

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