[strings, algorithms, diff] Replace 'routine' with 'function'. (#1217)

Author: Eelis

source/algorithms.tex

@@ -1353,7 +1353,7 @@
 algorithms.
 \begin{note}
 Implementations must ensure that internal synchronization inside standard
-library routines does not prevent forward progress when those routines are
+library functions does not prevent forward progress when those functions are
 executed by threads of execution with weakly parallel forward progress guarantees.
 \end{note}
 \begin{example}

source/compatibility.tex

@@ -614,7 +614,7 @@
 \end{codeblock}
 \rationale
 When these non-terminated arrays are manipulated by standard
-string routines, there is potential for major catastrophe.
+string functions, there is potential for major catastrophe.
 \effect
 Deletion of semantically well-defined feature.
 \difficulty

source/strings.tex

@@ -5118,7 +5118,7 @@
 \begin{note}
 Unlike \tcode{basic_string::data()} and string literals,
 \tcode{data()} may return a pointer to a buffer that is not null-terminated.
-Therefore it is typically a mistake to pass \tcode{data()} to a routine that takes just a \tcode{const charT*} and expects a null-terminated string.
+Therefore it is typically a mistake to pass \tcode{data()} to a function that takes just a \tcode{const charT*} and expects a null-terminated string.
 \end{note}
 \end{itemdescr}