[doc] Fix gtk-doc warning
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@ -776,7 +776,7 @@ hb_cairo_font_face_get_scale_factor (cairo_font_face_t *font_face)
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* cairo_user_scaled_font_text_to_glyphs_func_t.
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*
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* The @num_glyphs argument should be preset to the number of glyph entries available
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* in the @glyphs buffer. If the @glyphs buffer is %NULL, the value of
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* in the @glyphs buffer. If the @glyphs buffer is `NULL`, the value of
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* @num_glyphs must be zero. If the provided glyph array is too short for
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* the conversion (or for convenience), a new glyph array may be allocated
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* using cairo_glyph_allocate() and placed in @glyphs. Upon return,
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@ -785,11 +785,11 @@ hb_cairo_font_face_get_scale_factor (cairo_font_face_t *font_face)
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* allocated glyph array using cairo_glyph_free(). The caller will also free
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* the original value of @glyphs, so this function shouldn't do so.
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*
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* If @clusters is not %NULL, then @num_clusters and @cluster_flags
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* If @clusters is not `NULL`, then @num_clusters and @cluster_flags
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* should not be either, and @utf8 must be provided, and cluster
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* mapping will be computed. The semantics of how
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* cluster array allocation works is similar to the glyph array. That is,
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* if @clusters initially points to a non-%NULL value, that array may be used
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* if @clusters initially points to a non-`NULL` value, that array may be used
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* as a cluster buffer, and @num_clusters points to the number of cluster
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* entries available there. If the provided cluster array is too short for
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* the conversion (or for convenience), a new cluster array may be allocated
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@ -604,7 +604,7 @@ hb_face_collect_unicodes (hb_face_t *face,
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* hb_face_collect_nominal_glyph_mapping:
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* @face: A face object
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* @mapping: (out): The map to add Unicode-to-glyph mapping to
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* @unicodes: (nullable) (out): The set to add Unicode characters to, or %NULL
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* @unicodes: (nullable) (out): The set to add Unicode characters to, or `NULL`
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*
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* Collects the mapping from Unicode characters to nominal glyphs of the @face,
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* and optionally all of the Unicode characters covered by @face.
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