[Ada] Fix repeated words and typos in doc and comments

[Ada] Fix repeated words and typos in doc and comments

2019-12-12  Piotr Trojanek  <trojanek@adacore.com>

gcc/ada/

	* libgnat/g-altive.ads: Fix typo in comment.
	* bindo-graphs.adb: Fix repeated words in comment.
	* exp_ch4.adb: Likewise.
	* exp_ch5.adb: Likewise.
	* exp_ch7.adb: Likewise.
	* exp_pakd.adb: Likewise.
	* exp_unst.adb: Likewise.
	* exp_util.adb: Likewise.
	* freeze.adb: Likewise.
	* inline.adb: Likewise.
	* layout.adb: Likewise.
	* sem_ch12.adb: Likewise.
	* sem_ch13.adb: Likewise.
	* sem_ch4.adb: Likewise.
	* sem_ch9.adb: Likewise.
	* sem_elab.adb: Likewise.
	* doc/gnat_ugn/gnat_and_program_execution.rst: Fix repeated
	words in user documentation.
	* gnat_ugn.texi: Regenerate.

From-SVN: r279294